圆筒形拉伸冲压零件下料公式的修正方法

在冲压拉伸制造薄板形零件的模具设计制造中,通常都是先利用公式计算出落料尺寸,根据这个尺寸制造出落料凸模和落料凹模,试生产后再根据制件的误差对落料凸模和落料凹模进行修改,如果成本高,效率低,就通过探讨误差生成的原因以及做出应对的修正方法,从缩小误差,提高试生产效率方面考虑,设法缩短试制时间。     

钛合金蜂窝三层结构的扩散焊接研究

介绍了俄罗斯钛合金蜂窝三层结构扩散焊接的研究成果.详细介绍了铝合金、焊接规范选择、接头应力变形状态的分析、模拟计算等,有助于国内钛合金的焊接研究.     

Experimental method for and theoretical research on defect tolerance of fixed plate based on damage mechanics

An experimental method and a theoretical analysis based on continuum damage mechan-ics are applied for the defects tolerance of fixed plate. The defects type studied in this article is scratch, which i...     

Experimental method for and defect tolerance of fixed plate theoretical research on based on damage mechanics

An experimental method and a theoretical analysis based on continuum damage mechan- ics are applied for the defects tolerance of fixed plate. The defects type studied in this article is scratch, which is considered a typical defect on fixed plate according to the engineering practice. The general approach to the defects tolerance analysis of scratched fixed plate is presented. The method of fatigue life prediction for standard notched specimens has been established on the basis of continuum damage mechanics. For the purpose of obtaining the influence law of fatigue life in consequence of scratches, fatigue experiments of standard notched specimens and scratched specimens have been done. Evalu- ation of the fatigue life of scratched fixed plate has been carried out. And the value of scratch defects permissible to the condition of safety service life has been worked out. According to the results of the- oretical calculations, the fatigue experiment of scratched fixed plate has been performed. The outcome shows that the theoretical prediction tallies with the experimental results.     

Nb、Ti微合金元素对中厚板组织结构及力学性能的影响

Q345B普通钢板在控制轧制过程中适量添加了Nb、Ti微合金元素，通过金相观察、力学试验，其组织结构及力学性能均有明显改善，可见通过对微合金元素的选择性添加以及对其在钢中成分的控制，在经过控轧控冷后能够得到我们所需求性能的钢，这对控制轧制具有较高的现实意义。     

复变函数与数值法相结合计算复合材料层合板的应力场

 在各向异性数学弹性理论的基础上,把复应力函数φ_1(z-1)和φ_2(z_2)分别在z_1和z_2平面的域内展开成复Taylor级数,并用边界配点最小二乘法确定级数系数,从而计算受面内载荷作用单连通复合材料层合板的应力场。文中进行了算例分析,给出了应力随级数项数和边界所配点数的变化曲线。结臬表明,本方法具有形式简单、原始数据准备工作量小、计算精度高、所需计算机容量小和计算时间短等特点。     

损伤力学在研究金属高周疲劳问题中的应用

 本文用损伤力学研究金属高周疲劳问题。假设损伤为各向同性,并考虑应力与损伤的互耦效应,用有限元法,预估了含缺口板材试件的疲劳寿命。计算和实验S-N曲线表明,本方法预估寿命误差在工程允许范围内。     

带裂纹板在冲击载荷作用下动态应力强度因子的数值计算

 本文使用八节点等参元和六节点畸变等参元的有限元方法,计算了中心穿透裂纹板在冲击载荷作用下的动态应力强度因子,并与Chen和Aberson的计算结果作了比较,本文的结果具有较高的精度和较少的计算量。文中还给出了动载影响系数k₁（t）和静态应力强度因子的关系式。并考虑了材料特性和板的几何尺寸对于动态应力强度因子的影响。     

ANALYTICAL VARIATIONAL METHOD OF SOLUTION FOR STRESS CONCENTRATION FACTORS OF FINITE PLATES WITH A PIN HOLE

ＡＮＡＬＹＴＩＣＡＬＶＡＲＩＡＴＩＯＮＡＬＭＥＴＨＯＤＯＦＳＯＬＵＴＩＯＮＦＯＲＳＴＲＥＳＳＣＯＮＣＥＮＴＲＡＴＩＯＮＦＡＣＴＯＲＳＯＦＦＩＮＩＴＥＰＬＡＴＥＳＷＩＴＨＡＰＩＮＨＯＬＥＸｉＹｕａｎｓｈａｎ；ＺｈａｎｇＸｉｎｇ（Ｄｅｐａｒｔｍｅｎｔｏｆ...     

广义协调条件的薄板弯曲三角形元和矩形元

其中兀_p和π_(mp)是最小势能原理和修正势能原理的泛函;w是单元内挠度;(?)、_(?)_n、(?)_s是单元间的位移;Q_n、M_n、M_(ns)是单元周线(?)A_e上的边界力。如果单元内部位移场在单元周线上的位移[w、((?)w)/((?)n)、((?)w)/((?)s)]和单元边界位移[(?)、(?)_n、(?)_s]~T满足广义协调条件