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首页> 外文期刊>Experimental Mechanics >Deformation of a Composite Disk Having a Tapered Clamped Boundary
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Deformation of a Composite Disk Having a Tapered Clamped Boundary

机译：具有锥形夹紧边界的复合盘的变形

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An out-of-plane displacement analysis is conducted on a circular composite disk in which a pre-stressed condition is created by clamping the specimen along a tapered boundary. This configuration is designed to lower the boundary stresses when uniform pressures are subsequently applied during permeability tests developed to study potential microcracking and permeability resistant material systems for cryogenic tank usage. A finite element analysis of the pre-stressed condition predicted a displacement field in which the location of the maximum out-of-plane displacement did not coincide with the principal material coordinate system despite the fact that the specimen was symmetric with respect to its mid-plane and uniformly clamped around the boundary. This was attributed to variations in the terms contained in the bending stiffness matrix which were shown to change as a function of the angle measured relative to the principal material directions. The finding was investigated by using the method of speckle metrology and digital image correlation to experimentally measure the displacement field. A comparison between the experimental and analytical results showed a very good agreement, thereby validating the finite element model and its prediction.
机译：在圆形复合材料圆盘上进行平面外位移分析，在该复合圆盘中，将试样沿锥形边界夹紧会产生预应力状态。此配置旨在在开发渗透性测试期间随后施加均匀压力时降低边界应力，该渗透性测试旨在研究用于低温储罐的潜在的抗微裂纹和抗渗透性材料系统。对预应力条件的有限元分析预测了一个位移场，其中最大平面外位移的位置与主要材料坐标系不重合，尽管试样相对于其中点是对称的。平面并均匀地夹在边界周围。这归因于抗弯刚度矩阵中包含的项的变化，这些变化显示为相对于主要材料方向测量的角度的函数而变化。通过斑点测量和数字图像相关的方法对这一发现进行了研究，以实验测量位移场。实验结果和分析结果之间的比较显示出很好的一致性，从而验证了有限元模型及其预测。

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