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1.
A procedure for the separation of principal stresses in automated photoelasticity is presented. It is based on the integration
of indefinite equations of equilibrium along stress trajectories, also known as Lamè–Maxwell equations. A new algorithm for
precise and reliable stress trajectory calculation, which is an essential feature of the procedure, has also been developed.
Automated stress separation is carried out along stress trajectories starting from free boundaries. Experimental tests were
performed on a disc in diametral compression and on a ring with internally applied pressure. Full-field principal stress values
were obtained and results were compared with those from the theory of elasticity and with those obtained from the classical
shear difference method. It was shown that the proposed method is more accurate and less affected by the presence of residual
stresses or experimental errors at the boundaries than the shear difference method. In addition, the method requires little
human interaction and is therefore well-suited for automated photoelasticity. 相似文献
2.
光弹性应力分析是一种重要的实验方法,确定等倾线参数和等差线参数是光弹法的关键。常用的六步相移法可以自动确定等倾线和等差线参数,但在求解等倾角时,由于不能避免等倾线相位图中耦合等差线的影响,会造成误差。针对这个问题,本文提出优化方案--多次载荷-六步相移法,实现在等倾线相位图求解中消除等差线的影响。通过处理对称受压圆盘在不同载荷、不同光场下得到的光弹图像,实现光弹性等倾线和等差线的自动判读,验证了所提方法的可行性。 相似文献
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The Coherent Gradient Sensor (CGS) is extended to the optical differentiation of specular, diffracted wave fronts leading
to the combined measurement of in- and out-of-plane displacement field gradients. A derivation of the underlying optical interference
principles is presented along with an analysis of the effective instrument sensitivity. In order to demonstrate the capabilities
of the technique, experimental measurements of crack-tip deformation fields were conducted under various loading conditions
corresponding to mode-I, mode-II, and mixed mode near-tip crack fields. The experimental procedures and results of these tests
are presented as validation of the technique. 相似文献