圆棒拉伸试样蠕变过程中的应力应变分布分析

1.西安西北工业大学,力学与土木建筑学院,陕西,西安,710072

2.西安西北工业大学,力学与土木建筑学院,陕西,西安,710072

3.西安西北工业大学,力学与土木建筑学院,陕西,西安,710072

4.西安西北工业大学,力学与土木建筑学院,陕西,西安,710072

5.西安西北工业大学,力学与土木建筑学院,陕西,西安,710072

基金项目: 国家自然科学基金(50005016)

A study of the creep stress and strain characteristics of smooth and notched bars

对光滑及切口圆棒试样进行有限元蠕变分析,得到了蠕变过程时的应力应变分布.在相同的平均净拉伸蠕变应力下,切口的存在使得最小截面上的平均Mises应力和平均轴向应力小于光滑试样.切口还导致蠕变时的应力松弛并使得试样的最大应力不再发生在切口根部.这可以用来简单解释切口对试样断裂寿命的影响.

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