Effects of Preloading Level on a Warm Pre- Stressed Crack Speciman
Publish place: 13th Annual Conference of Mechanical Engineering
Publish Year: 1384
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
ISME13_608
تاریخ نمایه سازی: 21 اسفند 1385
Abstract:
The residual stress and the crack tip blunting are two major suggested mechanisms for justifying the improvement in the load bearing capacity of cracked specimens after warm pre-stressing. In this paper, the finite element method is used to simulate the warm pre-stressing in a three-point bend specimen. The specimen is preloaded and its effect on these two mechanisms is investigated. It is shown that in general both the residual stress and the crack tip blunting are important in warm pre-stre ssing. However, depending on the level of applied preload one of them can be considered as the main cause. It is shown that in low levels of preloading crack tip blunting is more influential and in contrast, it is compressive residual stress that plays more important role in high levels of preloading.
Keywords:
Warm Pre-stress – FEM - Residual Stress - Crack Tip Blunting – Cleavage Fracture
Authors
Ayatollahi
Associate Professor Fatigue and Fracture Laboratory, Department of Mechanical Engineering, Iran University of Science and Technology, Narmak, Tehran, Iran
Mostafavi
Graduate Student Fatigue and Fracture Laboratory, Department of Mechanical Engineering, Iran University of Science and Technology, Narmak, Tehran, Iran
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