When composite products are machined to designed shapes, geometrical deformations are generated with removal of materials, which is caused by release of residual stresses generated during the curing process of composite materials. Due to the uncontrollability of the deformation in machining process, both requirements of form and dimensional tolerances are difficult to meet. Inspired by the relationship between material removal and stress release of the slitting method, a deformation control methodology by introducing stress‐release‐groove in machining process was proposed. Residual stresses were firstly measured by using the slitting method and the distribution of residual stresses in thickness direction was estimated. Finite element model was then created and used to study the influence of machining process on geometrical deformation of the composite. It was found that the pre‐processing grooves can reduce the subsequent processing deformation and consequently improve the machining accuracy. To make the release of stress controllable, the influences of width, spacing, depth, and processing sequence of grooves on machining deformation were numerical studied.

中文翻译：

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纤维金属层压板的加工变形控制研究

当将复合产品加工成设计形状时，材料的去除会产生几何变形，这是由于复合材料固化过程中产生的残余应力的释放而引起的。由于加工过程中变形的不可控性，形状和尺寸公差都难以满足。受开槽方法的材料去除和应力释放之间关系的启发，提出了一种在加工过程中引入应力释放槽的变形控制方法。首先采用切缝法测量残余应力，并估算残余应力在厚度方向上的分布。然后创建了有限元模型，用于研究加工过程对复合材料几何变形的影响。发现预处理凹槽可以减少后续的加工变形，从而提高加工精度。为了使应力的释放可控，研究了沟槽的宽度，间距，深度和加工顺序对加工变形的影响。