在夫琅和费衍射区域内，光斑图像中央是亮光斑，周围环绕着明暗交替的圆环。
In Fraunhofer diffraction area, the spot center is light spot, around encircle light and dark ring.
用x2350a型x射线应力衍射仪测试冲击区域残余应力分布情况，并用有限元软件ABAQUS进行模拟。
X2350A X-ray strain instrument was introduced to test the residual stress in the shocked region, and finite element software ABAQUS was used to simulate the stress.
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