Finite element analysis for delamination of laminated vibration damping steel sheet

The material structure of laminated vibration damping steel sheet(LVDSS) was introduced in detail. An interface cohesive model between the skin sheets was developed by using a contact/interface approach, and the model was applied to simulate “T”-peel and lap-shear processes of LVDSS. The interface contact stress distribution during the “T”-peel and lap-shear processes is obtained, and the finite element analysis(FEA) results agree satisfactorily with the corresponding experimental results. As a result, the model is suitable to simulate the cohesive of

树脂复合减振板脱层缺陷研究

树脂复合减振板由两层钢板中间夹树脂层构成的,能起到减振降噪的效果。针对减振板的冲压成形过程中出现的起皱、破裂及脱层、表层滑移等缺陷,通过法向极限位移试验及切向极限位移试验建立减振板脱层的判据,通过经验公式建立成形极限的判据,并在此判据的基础上建立树脂复合减振板成形性判断系统,直观地反应减振板的脱层缺陷,并对U弯实验的脱层进行了验证。

冷轧镀锌板冲压分层开裂原因分析

针对近几年汽车厂反映的冷轧镀锌板冲压后分层开裂的问题,为了研究该缺陷产生原因,选取4块典型的冲压分层开裂试样,使用扫描电镜和能谱仪对缺陷的微观特征进行了分析。结果表明,引起冷轧镀锌板冲压分层开裂的主要原因为保护渣卷入、皮下夹杂物、异物压入、擦划伤4种情况。4种缺陷的产生原因各不相同,但造成开裂的机理基本类似,对每一类缺陷的形成原因和开裂机理进行了分析与讨论,并提出了改善措施,为缺陷的原因排查、工序分离和质量改进提供了方向。