求翻译：一般喷丸形成的残余应力沿深度方向是变化的，但是，在一定深度范围内，材料力学性能变化不大，可以认为是相同的。因此，这个厚度范围内的材料可以用一个模型描述。这样，含有残余应力的材料的力学模型问题可以变得比较简单。是什么意思？

General shot peening residual stress along the depth direction is changing, however, in a certain depth range, the mechanical properties changed little, that is the same. Therefore, this thickness range of materials can be described with a model. In this way, the mechanical model of material contain

正在翻译，请等待...

Spurts the residual stress which the pill forms along the depth direction is generally the change, but, in certain depth scope, the materials mechanics performance change is not big, may think is same.Therefore, in this thickness scope material may use a model to describe.Thus, includes the residual

正在翻译，请等待...

正在翻译，请等待...