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11.
本文利用动态光弹性法研究了炮膛膛线脱落的机理。用包含五条膛线的部分炮筒横截面或扇形平面模型,在六种不同的载荷状态下进行了实验。得到了不同载荷状态下,不同瞬时的等差线条纹图的系列照片,以及膛线根部不同瞬时的应力分布曲线。结果表明:当一条或相邻数条膛线顶端受到足够大的均布冲击载荷时,将在承载膛线两侧根部的应力极值点出现膛线脱落的起裂点,而形成八字形脱落;而对非均布的其它几种冲击载荷,膛线都不会出现八字形脱落。 相似文献
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Phase shifting photoelasticity in white light 总被引:1,自引:0,他引:1
Augusto Ajovalasit Giovanni Petrucci Michele Scafidi 《Optics and Lasers in Engineering》2007,45(5):596
The availability of image acquisition systems has led to the development of digital photoelasticity both in monochromatic and white light. In particular white light has been used mainly with the following methods: Spectral Content Analysis, RGB photoelasticity and phase shifting photoelasticity. Phase shifting photoelasticity in the colour domain has been used effectively for the determination of the isoclinic parameter in order to reduce the influence of the isochromatic fringes. The method has been also proposed for the determination of the isochromatic fringe order. This paper concerns the general characteristics of phase shifting photoelasticity in the colour domain. Special attention is drawn towards the influence of spectral content of the light source, the spectral response of the colour camera filters, the dispersion of the birefringence and the error of quarter wave plates. 相似文献
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付宝连 《应用数学和力学(英文版)》1996,17(1):38-44
FuBaolian(付宝连)(ReceivedNov.22,1993;CommunicatedbyChienWeizang)COUPLEDVARIATIONALPRINCIPLESANDGENERALIZEDCOUPLEDVARIATIONALPRI... 相似文献
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The generation and the subsequent evolution of dynamic failure events in homogeneous layered materials that occur within microseconds after impact were investigated experimentally. Tested configurations include three-layer and two-layer, bonded Homalite specimens featuring different bonding strengths. High-speed photography and dynamic photoelasticity were utilized to study the nature, sequence and interaction of failure modes. A series of complex failure modes was observed. In most cases, and at the early stages of the impact event, intra-layer failure (or bulk matrix failure) appeared in the form of cracks radiating from the impact point. These cracks were opening-dominated and their speeds were less than the crack branching speed of the Homalite. Subsequent crack branching in several forms was also observed. Mixed-mode inter-layer cracking (or interfacial debonding) was initiated when the intra-layer cracks approached the interface with a large incident angle. The dynamic interaction between inter-layer crack formation and intra-layer crack growth (or the so-called “Cook–Gordon Mechanism”) was visualized for the first time. Interfacial bonding played a significant role in impact damage spreading. Cracks arrested at weak bonds and the stress wave intensity was reduced dramatically by the use of a thin but ductile adhesive layer. 相似文献
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工艺应力模拟技术中的热相似律 总被引:1,自引:0,他引:1
分析了热处理及焊接的热过程,从热传导的基本方程及边界条件出发,结合不同工艺过程的特点,提出了用光弹法模拟整体淬火热应力,表面淬火热应力和焊接过程热应力及残余应力的热相似律。 相似文献
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Zirka A. I. Malezhik M. P. Chernyshenko I. S. Sheremet G. P. 《International Applied Mechanics》2004,40(7):810-813
The stress wave field and the behavior of waves near the free boundary in an orthotropic plate and at the interface between two anisotropic media are studied. The results presented were obtained using the dynamic photoelastic method and optically sensitive fibrous models. Experimental data for impulsively loaded plates with various boundary conditions are analyzed 相似文献
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宽厚板厂房的行车轨道在行车运行时承受来自行车水平导向轮的水平推力,该水平推力可能导致压轨器破坏,为确保压轨器的安全设计,采用平面光弹性、三维光弹性进行实验测试,分析在最不利工况下,各种压轨器所承担的水平推力份额,压轨器的变形和应力分布,给出强度分析评估,确定系统中各个压轨器以及固定螺栓的关键部位的应力水平。 相似文献