In this modem era a lot of development has taken place in jointing technology but still the bolte... more In this modem era a lot of development has taken place in jointing technology but still the bolted joint is the most important jointing method. Bolted joints are mostly used in motor transport, aircraft and other machine tool industries. The effectiveness of a bolted joint is usually measured by its ability to maintain an adequate level of clamping force on the jointing surface. It has been found that friction condition between the bolt under head and the matting surface has greatly influenced the magnitude of the clamping force and wrenching torque. In the present study detail experimental investigation, regarding the behavior of jointing bolt under different lubricating condition as well as under external load was carried out. Further more, the relationship between the wrenching torque and the torque transmitted to the shank of the bolt was also established. It has been observed that the better the lubricating condition between the bolt under head and the mating surfaces, the bett...
The effect of autofrettage process on thick-walled cylinders has been investigated here. It is ob... more The effect of autofrettage process on thick-walled cylinders has been investigated here. It is observed that flow stress distribution along the cylinders remains same for same k values. Comparison with Zhu & Yang's model has been also done in determination of optimum elasto-plastic radius, r opt and optimum autofrettage pressure, p opt. Equivalent von Mises stress is used as yield criterion. It is observed that percentage of reduction of maximum von Mises stress increases as value of k and working pressure increases. Maximum von Mises stress is minimum for lower working pressure at same value of k and autofrettage pressure. Autofrettage process never starts if autofrettage pressure does not exceed working pressure. It is also observed that two limits of autofrettage pressure Py1 & Py2 are not appropriate. Effect of loading stages on autofrettage process is also investigated. As long as the pressures in first and last stage remains constant, there is no effect of loading stages o...
In this modem era a lot of development has taken place in jointing technology but still the bolte... more In this modem era a lot of development has taken place in jointing technology but still the bolted joint is the most important jointing method. Bolted joints are mostly used in motor transport, aircraft and other machine tool industries. The effectiveness of a bolted joint is usually measured by its ability to maintain an adequate level of clamping force on the jointing surface. It has been found that friction condition between the bolt under head and the matting surface has greatly influenced the magnitude of the clamping force and wrenching torque. In the present study detail experimental investigation, regarding the behavior of jointing bolt under different lubricating condition as well as under external load was carried out. Further more, the relationship between the wrenching torque and the torque transmitted to the shank of the bolt was also established. It has been observed that the better the lubricating condition between the bolt under head and the mating surfaces, the bett...
The effect of autofrettage process on thick-walled cylinders has been investigated here. It is ob... more The effect of autofrettage process on thick-walled cylinders has been investigated here. It is observed that flow stress distribution along the cylinders remains same for same k values. Comparison with Zhu & Yang's model has been also done in determination of optimum elasto-plastic radius, r opt and optimum autofrettage pressure, p opt. Equivalent von Mises stress is used as yield criterion. It is observed that percentage of reduction of maximum von Mises stress increases as value of k and working pressure increases. Maximum von Mises stress is minimum for lower working pressure at same value of k and autofrettage pressure. Autofrettage process never starts if autofrettage pressure does not exceed working pressure. It is also observed that two limits of autofrettage pressure Py1 & Py2 are not appropriate. Effect of loading stages on autofrettage process is also investigated. As long as the pressures in first and last stage remains constant, there is no effect of loading stages o...
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