继电器触点冷镦成形过程的有限元分析
发布时间：2018-09-17 06:42
【摘要】：研究了Ag Sn O2类材料单体触点在镦制过程中的开裂问题,并将银丝材料拉伸试验曲线转化成真应力、应变数据,拟合得到银丝材料流变应力数学模型。应用有限元方法,模拟了银单体触点的冷镦成形过程,得到了冷镦成形过程中的等效应变、应力分布情况。研究结果表明,拉应力越靠近外层越大,而径向压应力则越靠近外层越小,变形物体的单位压力从外向内逐渐增大,因此,触点最大直径处为易开裂位置。此外,准确预测了成形过程中材料产生裂纹缺陷的位置及裂纹程度,当变形达到材料Damage值时,裂纹开始形成,Damage值随变形程度的增加而上升。通过试验,对开裂模拟结果进行了验证,模拟结果与试验吻合较好。
[Abstract]:The cracking of Ag Sn O 2 monomer contact during upsetting was studied. The tensile test curve of silver wire was transformed into true stress and strain data, and the mathematical model of flow stress of silver wire was obtained. The cold heading forming process of silver monomer contact was simulated by using finite element method, and the equivalent strain and stress distribution in the cold heading forming process were obtained. The results show that the closer the tensile stress is to the outer layer and the smaller the radial compressive stress is, the larger the unit pressure of the deformed object is from the outside to the inside. Therefore, the maximum diameter of the contact point is prone to crack. In addition, the position of crack defects and the degree of crack in the forming process are accurately predicted. When the deformation reaches the Damage value of the material, the crack formation damage value increases with the increase of the deformation degree. The results of cracking simulation are verified by experiments, and the simulation results are in good agreement with the test results.
【作者单位】： 厦门金波贵金属制品有限公司;
【基金】：国家自然科学基金资助项目(51471027)
【分类号】：TG306;TM58
[Abstract]:The cracking of Ag Sn O 2 monomer contact during upsetting was studied. The tensile test curve of silver wire was transformed into true stress and strain data, and the mathematical model of flow stress of silver wire was obtained. The cold heading forming process of silver monomer contact was simulated by using finite element method, and the equivalent strain and stress distribution in the cold heading forming process were obtained. The results show that the closer the tensile stress is to the outer layer and the smaller the radial compressive stress is, the larger the unit pressure of the deformed object is from the outside to the inside. Therefore, the maximum diameter of the contact point is prone to crack. In addition, the position of crack defects and the degree of crack in the forming process are accurately predicted. When the deformation reaches the Damage value of the material, the crack formation damage value increases with the increase of the deformation degree. The results of cracking simulation are verified by experiments, and the simulation results are in good agreement with the test results.
【作者单位】： 厦门金波贵金属制品有限公司;
【基金】：国家自然科学基金资助项目(51471027)
【分类号】：TG306;TM58
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