摘要
为研究应力三维度和塑性应变对金属材料微孔聚合型损伤发展和延性断裂过程的影响,用有限元法计算16Mn钢和两种铝合金材料不同缺口根半径拉伸试样的应力、应变分布.结果表明:缺口根半径越小,最小横截面上周向和径向应变相差越大且越不均匀,并导致最小横截面上的应力三维度与Bridgman公式预测结果不一样.材料性质和试样几何形状对应力三维度的影响很大:缺口根半径相同的3种材料试样最小横截面的应力三维度分布形态相似,但应力三维度峰值及其所处位置有所不同;同种材料的试样缺口根半径不同,应力三维度分布形态也不同.
To study the influence of stress triaxiality and plastic strain on the microvoid coalescence damage development and ductile fracture process of metal materials, the stress and strain distributions of the tensile specimens with different notch root radius are calculated by finite element method for 16Mn steel and two kinds of aluminum alloys. To the smallest cross-section, the results show that the smaller notch root radius leads to the larger difference between the circumferential strain and the radial strain, the less uniform of the strain, and the difference of the stress triaxiality from the one predicted by Bridgman equation. The material properties and the specimen geometry have a very important influence on stress triaxiality. That is, although the tress triaxiality distribution are similar at the smallest cross-section for three kinds of specimens with the same notch root radius, the maximum values and their locations are different; the stress triaxiality distributions are different for the same kind of material specimens with different notch root radius.
出处
《计算机辅助工程》
2009年第3期16-22,共7页
Computer Aided Engineering
