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雷志辉;王仁;苏先基 《力学与实践》1986,8(1)
焦散线法是Manogg在1964年提出来的,现已发展成一个主要的断裂力学实验方法。国内近些年对焦散线法的兴趣也日益浓厚,但由于设备条件的限制,仍限于静态的断裂实验。本文研究了动态焦散线法在断裂力学中的 相似文献
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<正> 由国际理论与应用力学联合会(IUTAM)召开的4年一次的第18届国际理论与应用力学大会(ICTAM-18),于1992年8月22—28日在以色列海法市的以色列工业学院举行。大会选定的3个主题是:固体与结构力学中的不稳定性;海面力学与海气相互作用;生物力学。设置主题分会的目的是对力学中的某些重要领域做综合介绍,以强调这领域的重要性,或对新领域起提倡作用。 相似文献
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1960年科学出版社出版的李敏华同志所著的“硬化材料的轴对称塑性平面应力问题的研究”是一本塑性力学方面的理论性专著。 塑性变形就其本质上来说是一个不可逆的过程。在每一个时刻,我们只能知道由于载荷的增加(或边界上位移的增加)所引起的物体内部的变形和应力的改变,而不能确定 相似文献
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The paper reviews several methods of simulation used in this country to recover currenttectonic stress field related to earthquake occurrence in North China. The aim is to evaluatethe degree of seismic risk around Beijing area. The methods used are computational ormathematical simulation by the finite element method and experimental or physical simulationby the photoelastic method and the grid method. The results obtained by these methods arebriefly described. Most simulations indicate that Beijing is not a region of seismic risk. 相似文献
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A scheme in Fig. l is used to simulate the earthquake sequence in North China in the last 700 years. With a postulated fault system, a mechanical parameter distribution and suitable boundary tractions, the stress field is computed by finite element method in plane strain. The fault zones are treated as elastic-perfectly plastic medium which flows according to Coulomb's criterion and its associated flow rule. An earthquake is simulated by lowering the static coefficient of friction to a kinetic one at the epicenter to cause a slip there and arrived at a new equilibrium position. The differences in displacement, stress, etc. before and after the lowering are considered to be due to the earthquake and compared to observations. After adjustments of parameters and boundary tractions, the results are satisfactorily compared with the major earthquake sequence of 14 events M_s≥7 and regions of seismic risk in the last 700 years. Possible localities of future earthquake risk after the Tangshan earthquake and ef 相似文献
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高分子材料粘弹塑性本构关系研究进展 总被引:6,自引:1,他引:5
总结和评述了高分子材料粘弹塑性本构关系的研究成果,并介绍了笔者利用模糊约束法建立的模糊随机高分子网络力学体系。 相似文献