CAJ | 학술논문

目的确定球形空腔在混凝土介质中膨胀时球形空腔表面的应力. 方法在Euler坐标系中,采用Mohr-Coulomb屈服准则,应用相似变换的方法推导了球形空腔在混凝土介质中膨胀时弹、塑性区径向无量纲应力的解析表达式. 结果得到了球形空腔表面上径向无量纲应力,分析了球形空腔表面无量纲径向应力与锁定体积应变的关系. 结论将得到的球形空腔表面应力应用于弹丸侵彻混凝土介质的侵彻方程后,得出的结果与试验结果的相对误差小于15.8%.
목적학정구형공강재혼응토개질중팽창시구형공강표면적응력. 방법재Euler좌표계중,채용Mohr-Coulomb굴복준칙,응용상사변환적방법추도료구형공강재혼응토개질중팽창시탄、소성구경향무량강응력적해석표체식. 결과득도료구형공강표면상경향무량강응력,분석료구형공강표면무량강경향응력여쇄정체적응변적관계. 결론장득도적구형공강표면응력응용우탄환침철혼응토개질적침철방정후,득출적결과여시험결과적상대오차소우15.8%.
Aim To determine the stress on wall of the spherical cavity while the spherical cavity expanding in concrete. Methods In Eulerian coordinate, the dimensionless radial stress equations were derived for the spherically symmetric, cavity-expansion problem in plastic and elastic region of concrete by means of the similarity transformation. In the equations, Mohr-Coulomb yield criterion was used.Results The dimensionless radial stress profiles were obtained. The relation between the dimensionless radial stress and the locked volumetric strain was analysed.Conclusion The test results show that the relative error between the model, which is applied in the closed-form penetration equations that are developed, and the test data is less than 15.8%.