Ari Caliskan

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Anthony Waas

University of Washington

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University of Wisconsin-Madison

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Michael Aldridge

University of Michigan

Seyedmohammad S Shams

University of Wisconsin Milwaukee

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Papers by Ari Caliskan

Discrete Cohesive Zone Model to Simulate Static Fracture in Carbon Fiber Composites

Deep Blue (University of Michigan), 2005

A discrete cohesive zone model (DCZM) is developed to simulate the mode I and mixed mode fracture... more A discrete cohesive zone model (DCZM) is developed to simulate the mode I and mixed mode fracture. For the mode I case, experimental results generated using a modified single edge notched bend specimen of a 2D triaxially braided composite (2DTBC) are used to verify the DCZM. The 2DTBC is modeled as an elastic one-parameter ("a66") plastic continuum. The plastic behavior of the 2DTBC is characterized by measuring a66. Fracture toughness (GIC) as a function of crack extension is measured by a compliance approach in the SENB tests. A previously developed mixed mode bending (MMB) fracture test configuration is a useful method to generate fracture envelopes for delamination failure of composites. The DCZM is used to simulate mixed mode fracture of a unidirectional laminated composite loaded using the MMB. The simulated results are compared with selected experimental results and also verified for mesh sensitivity. It is shown that the present DCZM is a versatile tool to study failure of a wide class of composite materials.

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Performance Simulation of High-Temperature Polymeric Composite Materials Using MRLife

Aerospace, Nov 17, 1996

The long-term performance of polymer matrix composites at elevated temperatures generally involve... more The long-term performance of polymer matrix composites at elevated temperatures generally involves a complex combination of time- and cycle-dependent behavior, such as fatigue, creep, stress rupture, micro-cracking, and aging. The present paper discusses how methods of representing composite strength are used in the MRLife performance simulation code to create a predictive capability that enables the user to estimate the remaining strength and life of composites based upon the properties, geometry, arrangement, and performance of the constituents. A micromechanical model of tensile strength is combined with the damage accumulation concepts in the MRLife code to represent the behavior of a graphite reinforced composite under thermo-mechanical loading conditions in air.

Crush mechanisms observed in polymeric composite tubes

In this study the crush mechanisms of polymer matrix composite tubes made with several material s... more In this study the crush mechanisms of polymer matrix composite tubes made with several material systems is reported. It was observed that for a given system, many different crush mechanisms could be observed. However, all systems showed a combination of four macroscopic and microscopic failure processes. They are fracture down the comers of the tube, bending of the fronds, kinking or fracturing of the fronds, and delamination of the fronds. Depending on the material system one or a combination of the failure modes dominated the crush behavior. As a result, depending on the failure modes different energy absorbtion was observed in the tubes.

<title>Fast infrared imaging of static and dynamic crush tests of composite tubes</title>

Proceedings of SPIE, Mar 19, 1999

We describe fast infrared imaging of both static and dynamic crush tests on glass-fiber composite... more

Micromechanics-based approach to predict strength and stiffness of composite materials

Metal Inert Gas (MIG) Welding Process Optimization for Joining Aluminum 5754 Sheet Material Using OTC/Daihen Equipment

Welding parameters play a great significant role in determining the weld joint quality in terms o... more Welding parameters play a great significant role in determining the weld joint quality in terms of weld-bead geometry. To obtain a good quality weld, it is necessary to select the proper welding parameters. This study focuses on the optimization parameters for Metal Inert Gas (MIG) welding on AISI 1018 mild steel by Teaching-Learning Based Optimization (TLBO) algorithm. The input parameters considered are welding current, workpiece thickness, voltage and wire feed rate. Taguchi's L 27 orthogonal array have been used for design of experiment (DoE) and the mathematical models have been developed for output response using MINITAB16. Results show that welding current and voltage are statistical significance on overall MIG welding performance.

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Performance Simulation of High-Temperature Polymeric Composite Materials Using MRLife

Aerospace

1 Fracture of 2D Triaxially Braided Carbon Fiber Composites and Resin Effects on the Energy Absorption

Results from an experimental program to investigate the propagation of damage in 2D triaxially br... more Results from an experimental program to investigate the propagation of damage in 2D triaxially braided carbon fiber textile composites (2DTBC) under static conditions are reported. A methodology is presented in which classical concepts from fracture mechanics are generalized to address damage growth in an orthotropic and heterogeneous structural material. Along with results from the experimental program, a novel numerical technique that employs ideas from cohesive zone modeling and implemented through the use of finite element analysis is also presented. The inputs that are required to implement such a discrete cohesive zone model (DCZM) are identified. Compact tension specimen (CTS) fracture tests were carried out by loading 2DTBC coupons cyclically and monotonically. Load and load point displacement were measured. The crack initiation, propagation and crack path history was recorded using high resolution digital photography. The measurements were used to extract the fracture energ...

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Proceedings of the IMECE08 2008 International Mechanical Engineering Congress and Exposition

An aluminum structure has many advantages over steel for automotive application, but the combinat... more An aluminum structure has many advantages over steel for automotive application, but the combination of lower weight, with high torsional stiffness and good energy management performance in crash is perhaps the most beneficial. Hybrid architectures, consisting of a combination of aluminum products including stampings, extrusions (straight and hydroformed) and castings, are becoming more common. The Ford GT represents the first Ford Motor Company hybrid aluminum spaceframe. The frame is comprised of castings, extrusions and stamped, flat and roll-bonded, panels. All structural connections between the extrusions and the castings are fusion welded with the exception of the front and rear crush structures. Ford R&AE supported the Ford GT program in the joining and assembly of the hybrid aluminum body architecture, with responsibility for the development of the Gas Metal Arc Welding (GMAW) process. Recognizing that the heat input from the GMA welding process is significant, it is necessa...

Strength characteristics and crack growth behavior of a composite with well aligned fibers

Continuous fiber composites have shown tremendous promise in industrial applications. Their micro... more Continuous fiber composites have shown tremendous promise in industrial applications. Their microstructures, however, are very complex and in many instances difficult to characterize. In this project, the fracture characteristics of a specially made fiber reinforced composite with different fiber spacing are investigated. The experimental results so far have shown that after an initial transient phase the crack speed reaches a steady phase, i.e., independent of the crack length. Within the steady crack growth phase debonding along the fibers in the bridging zone grows in a self-similar manner. During the steady phase the energy dissipation per cycle is constant. Afterwards, an increase of the energy dissipation is observed that is accompanied by a decrease in crack speed. This latter trend is presumed to be the result of relatively large amounts of energy dissipated in the bulk of the specimen. Using appropriate Green's function and computer simulations, the stress intensity fac...

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Stochastic Applications in Crashworthiness

Crashworthiness of Composites and Lightweight Structures

Due to geometrical, and material property variations, response of any structural member varies fr... more Due to geometrical, and material property variations, response of any structural member varies from the nominal design value. Typically the geometrical and material variations are the resultant of manufacturing variations. In this paper, the effect of these variations about the nominal values on structural response is studied using stochastic or probabilistic methods. Circular aluminum cross-sections are becoming popular in structural energy management applications. Also, significant research has been done to estimate the mean crush load for a circular section using empirical relations. An empirical relation, which is a function of thickness, outer radius, elastic modulus and yield strength, was used to estimate the mean crush load. Based on the measured thickness, outer radius and yield strength, the mean crush load is calculated using the empirical relation. Also, using the empirical relation, the variation in the mean crush load is estimated using linear statistical approach and ...

Frontal Impact Test and Analysis on an Aluminum Front-End Structure

Crashworthiness of Composites and Lightweight Structures

A frontal impact test was performed on a front-end module consisting of 6xxx series aluminum extr... more A frontal impact test was performed on a front-end module consisting of 6xxx series aluminum extrusions, and some 5xxx series aluminum stampings as reinforcements. The front end structure consists mainly of a bumper, cross member, radiator support, front and backup lower rails, upper rails, and shock tower support. In addition to the main structure, a subframe containing the engine was also attached to the back-up rails. The front-end module was mounted on a sled at the upper and lower A-pillar points as well as at the back-up rail. In addition to measuring the barrier forces, load cells were located behind the main structural members to determine load transfer. The results of the tests showed progressive folding of the crush rails, and adequate absorption of the impact energy. To aid in the design, a CAE model of the front-end was created to determine the crash behavior of the structure during frontal impact. The final model, which took into account, the material properties of the ...

Discrete Cohesive Zone Model To Simulate Static Fracture In Carbon Fiber Textile Composites

A discrete cohesive zone model (DCZM) is developed to simulate the mode I and mixed mode fracture... more A discrete cohesive zone model (DCZM) is developed to simulate the mode I and mixed mode fracture. For the mode I case, experimental results generated using a modified single edge notched bend specimen of a 2D triaxially braided composite (2DTBC) are used to verify the DCZM. The 2DTBC is modeled as an elastic one-parameter (“a66”) plastic continuum. The plastic behavior of the 2DTBC is characterized by measuring a66. Fracture toughness (GIC) as a function of crack extension is measured by a compliance approach in the SENB tests. A previously developed mixed mode bending (MMB) fracture test configuration is a useful method to generate fracture envelopes for delamination failure of composites. The DCZM is used to simulate mixed mode fracture of a unidirectional laminated composite loaded using the MMB. The simulated results are compared with selected experimental results and also verified for mesh sensitivity. It is shown that the present DCZM is a versatile tool to study failure of a...

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Lower longitudinal beam for a vehicle

Vehicle frame assembly and methods for making

The present invention relates to methods for producing vehicle frame assemblies. Some of the disc... more The present invention relates to methods for producing vehicle frame assemblies. Some of the disclosed methods include forming a wedge and support assembly between a connecting element comprising a first material composition, and a cross member, comprising a second material composition; Fixing the connecting element and of the crossbeam on the wedge and support assembly at a location; Insertion of the connecting element and of the crossbeam in a longitudinal beam and welding the connecting element to the longitudinal member at a different location.

Vehicle support frame with locking features to connect different materials

The present disclosure relates to various cross car beam assemblies and methods for making same. ... more

Subframe mounting an automobile frame

Reinforced frame-to-body attachment

Metal Inert Gas (MIG) Welding Process Optimization for Double Lap Joint Configuration of Aluminum 5754 Sheet Material Using OTC/Daihen Equipment

SAE SP, 2006

Abstract: Aluminum alloys are becoming more lucrative in automotive structural applications. In r... more

Design of Automotive Structures Using Multi-Model Optimization

SAE Technical Paper Series, 2017

Discrete Cohesive Zone Model to Simulate Static Fracture in Carbon Fiber Composites

Deep Blue (University of Michigan), 2005

Download

Performance Simulation of High-Temperature Polymeric Composite Materials Using MRLife

Aerospace, Nov 17, 1996

Crush mechanisms observed in polymeric composite tubes

<title>Fast infrared imaging of static and dynamic crush tests of composite tubes</title>

Proceedings of SPIE, Mar 19, 1999

We describe fast infrared imaging of both static and dynamic crush tests on glass-fiber composite... more

Micromechanics-based approach to predict strength and stiffness of composite materials

Metal Inert Gas (MIG) Welding Process Optimization for Joining Aluminum 5754 Sheet Material Using OTC/Daihen Equipment

Download

Performance Simulation of High-Temperature Polymeric Composite Materials Using MRLife

Aerospace

1 Fracture of 2D Triaxially Braided Carbon Fiber Composites and Resin Effects on the Energy Absorption

Download

Proceedings of the IMECE08 2008 International Mechanical Engineering Congress and Exposition

Strength characteristics and crack growth behavior of a composite with well aligned fibers

Download

Stochastic Applications in Crashworthiness

Crashworthiness of Composites and Lightweight Structures

Frontal Impact Test and Analysis on an Aluminum Front-End Structure

Crashworthiness of Composites and Lightweight Structures

Discrete Cohesive Zone Model To Simulate Static Fracture In Carbon Fiber Textile Composites

A discrete cohesive zone model (DCZM) is developed to simulate the mode I and mixed mode fracture... more A discrete cohesive zone model (DCZM) is developed to simulate the mode I and mixed mode fracture. For the mode I case, experimental results generated using a modified single edge notched bend specimen of a 2D triaxially braided composite (2DTBC) are used to verify the DCZM. The 2DTBC is modeled as an elastic one-parameter (“a66”) plastic continuum. The plastic behavior of the 2DTBC is characterized by measuring a66. Fracture toughness (GIC) as a function of crack extension is measured by a compliance approach in the SENB tests. A previously developed mixed mode bending (MMB) fracture test configuration is a useful method to generate fracture envelopes for delamination failure of composites. The DCZM is used to simulate mixed mode fracture of a unidirectional laminated composite loaded using the MMB. The simulated results are compared with selected experimental results and also verified for mesh sensitivity. It is shown that the present DCZM is a versatile tool to study failure of a...

Download

Lower longitudinal beam for a vehicle

Vehicle frame assembly and methods for making

Vehicle support frame with locking features to connect different materials

The present disclosure relates to various cross car beam assemblies and methods for making same. ... more

Subframe mounting an automobile frame

Reinforced frame-to-body attachment

Metal Inert Gas (MIG) Welding Process Optimization for Double Lap Joint Configuration of Aluminum 5754 Sheet Material Using OTC/Daihen Equipment

SAE SP, 2006

Abstract: Aluminum alloys are becoming more lucrative in automotive structural applications. In r... more

Design of Automotive Structures Using Multi-Model Optimization

SAE Technical Paper Series, 2017

Ari Caliskan

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