Martyn Pavier

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Virginie Boucher

CSIC (Consejo Superior de Investigaciones Científicas-Spanish National Research Council)

Fahmi Muhammad Ridwan

Universiti Malaysia Perlis (UniMAP)

Davide Nadali

Università degli Studi "La Sapienza" di Roma

Gautam Anand

Indian Institute of Engineering Science and Technology, Shibpur

David Reckhow

University of Massachusetts Amherst

Metalurgi Fisik (Physical Metallurgy) Reza Fadhila

State University of Medan

Gülsu Şimşek Franci

Gedik University

Osama El Hariri

Banha University At Egypt

mahmoud hafiz

Al-Azhar University

Baybars Ali Fil

Balikesir University

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Papers by Martyn Pavier

Clarifying the role of rigidity contrasts and rock interface strength in sill formation processes

by Janine Kavanagh and Martyn Pavier

Abstract Field observations, numerical and analogue models suggest rigidity contrasts may play an... more Abstract Field observations, numerical and analogue models suggest rigidity contrasts may play an important role in sill formation processes. We present results from analogue experiments and rock strength tests which explore the additional role that rock interface strength could have on the geometry and propagation dynamics of magmatic intrusions. Dyed water (a magma analogue) was injected into layers of solidified gelatine (a crustal analogue) to form experimental dykes and sills.

Prediction of fatigue crack growth rates using crack closure finite element analysis

A three-dimensional finite element fatigue crack closure model of a corner crack and of a through... more A three-dimensional finite element fatigue crack closure model of a corner crack and of a through thickness crack has been developed to evaluate the range of effective stress intensity factor from the distribution of the range of stress ahead of the crack tip. The corresponding fatigue crack growth rate was evaluated from a Paris law fit to experimental data from high stress ratio tests. The point of origin for the range of stress distribution was adjusted in accordance with Irwin’s plastic zone correction. Encouraging comparisons of finite element predictions of fatigue crack growth rate incorporating closure effects with experimental measurements were obtained.

Fatigue crack closure of a corner crack: A comparison of experimental results with finite element predictions

Plasticity induced corner crack closure has been examined for the case of a middle tension (MT) p... more Plasticity induced corner crack closure has been examined for the case of a middle tension (MT) plate of 14mm thick 2024-T351 aluminium alloy subjected to cyclic loading. The closure load has been found by comparing the strain just ahead of the crack tip with the far field strain as the specimen was loaded and then unloaded. Special crack detection strain

Application of the Modified Deep Hole Drilling Technique (iDHD) for Measuring Near Yield Non-Axisymmetric Residual Stresses

Volume 6: Materials and Fabrication, Parts A and B, 2009

ENGIN-X – instrument for materials science and engineering research

by Martyn Pavier and Yiqiang Wang

Neutron News, 2013

Impact damage to thick carbon fibre reinforced plastic composite laminates

Journal of Materials Science, 2006

Recently, very thick section laminates, up to 20 mm in thickness, have been proposed for the wing... more Recently, very thick section laminates, up to 20 mm in thickness, have been proposed for the wing skins of large aircraft. Composite components in all aircraft have concerns relating to the presence of accidental damage, but there has been little work to investigate the mechanisms and effects of damage in such thick sections. In this work, carbon fibre composite laminates of

Experimental and theoretical simulations of climbing falls

Sports Engineering, 1999

... A modern rock climber attempting difficult routes will expect to take a number of falls. Typi... more

Impact of thick CFRP laminates: the effect of impact velocity

Composites Part A-applied Science and Manufacturing, 2005

Carbon fibre reinforced polymer laminates of the order of 24 mm thick are being considered for th... more Carbon fibre reinforced polymer laminates of the order of 24 mm thick are being considered for the wing skins of large civil aircraft. These skins are susceptible to impact damage, which has implications on their long-term structural integrity. This can lead to conservative design. Impacts are often classified by the incident kinetic energy of the impactor alone, but there is some evidence that the impact velocity can have an important effect on the response and damage of a panel. Two panel geometries have been studied, each with 13 different impacts of constant impact energy using explicit finite element (FE) simulations. There is a significant effect observed due to different impact velocities on the panel response. Most importantly, the maximum stress in the panel was found to vary with impact velocity. Two experiments were carried out as a preliminary investigation into this effect. A simulated impact on a quasi-static test machine and a dynamic drop weight impact were carried out, and the residual tensile strength found in each case. The dynamically impacted specimen was found to have a 20% lower strength than the specimen with a simulated impact using a quasi-static test machine. Two further FE models, modelling the experiments more closely, found that the dynamically impacted panel experienced a higher stress state. This indicates that the reduction in tensile strength is due indirectly to inertial stiffening and a stress localisation effect.

Prediction of fatigue crack growth rates using crack closure finite element analysis

Failure Modes of a Platinum Aluminide Environmental Coating

by Peter E J Flewitt, Martyn Pavier, and Dong Liu

Procedia Materials Science, 2014

A platinum-aluminide environmental coating has been subjected to simulated operating thermal cycl... more A platinum-aluminide environmental coating has been subjected to simulated operating thermal cycles normally encountered in land-based gas turbines. The oxidation was undertaken in a mixture of gas with 6 vol.% steam. The specimens were subject to long term cycles (1000 hrs) at temperatures 850°C, 900°C, 950°C and 1050°C for up to ten cycles. Growth of the thermally grown oxides with thermal exposure is explored, and the fracture and delamination modes of the protective oxide layer were characterised by scanning electron imaging combined with focus ion beam milling. Two representative failure modes of the thermally grown oxide are proposed and discussed.

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Clarifying the role of rigidity contrasts and rock interface strength in sill formation processes

by Janine Kavanagh and Martyn Pavier