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Experimental Investigation on Low-Velocity Impact Response and Residual Compressive Bearing Capacity of Composite Stringers
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作者 CHEN Fang YAO Weixing WU Fuqiang 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2020年第4期655-662,共8页
Three types of composite stringers were impacted from two different directions.Relationships between impact energy and visible defect length were found.The critical impact energy corresponding to barely visible impact... Three types of composite stringers were impacted from two different directions.Relationships between impact energy and visible defect length were found.The critical impact energy corresponding to barely visible impact damage(BVID)of each stringer was determined.Specimens with BVID were then compressed to obtain the residual strength.Experimental results showed that for all types of stringers,the critical energy of in-plane impact is always much lower than out-plane ones.In-plane impact causes much more decrement of stringers'bearing capacity than outplane impact.For both impact directions,I-stringers own the highest defect detectability,T-stringers come second.Meanwhile,I-stringers own the better residual strength ratio than I-stringers and I-stringers.Synthetic considering impact defect detectability and residual bearing capacity after impact,T-stringers own the best compression-afterimpact(CAI)behaviors. 展开更多
关键词 composite stringer low-velocity impact defect compression after impact residual bearing capacity
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Stability and Approximate Analytical Periodic Solution of a Structurally Orthotropic Stringer Shell 被引量:1
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作者 Xia Liu Ruifang Wang Fabao Gao 《Journal of Applied Mathematics and Physics》 2020年第3期481-491,共11页
Combined with real engineering, we mainly study the stability of the equilibrium state at the coordinate center of an orthotropic stringer shell system, and the approximate analytic periodic motion is presented around... Combined with real engineering, we mainly study the stability of the equilibrium state at the coordinate center of an orthotropic stringer shell system, and the approximate analytic periodic motion is presented around the studied equilibrium state. In addition the rationality of the obtained results is verified by numerical simulation. Furthermore we found that there are actually only four kinds of phase portrait of this type of shell. 展开更多
关键词 STABILITY Periodic Solution STRINGER SHELL SUCCESSOR Function
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Buckling and post-buckling behavior of titanium alloy stiffened panels under shear load 被引量:8
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作者 Yuru SU Zhidong GUAN +3 位作者 Xin WANG Zengshan LI Jun GUO Yongjie HUANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2019年第3期619-626,共8页
Titanium alloy has been increasingly applied in aviation industry due to its superior performance. However, the titanium alloy structures are less studied. This work investigates the structural behavior of Ti6Al4V tit... Titanium alloy has been increasingly applied in aviation industry due to its superior performance. However, the titanium alloy structures are less studied. This work investigates the structural behavior of Ti6Al4V titanium alloy stiffened panels under in-plane shear load by experiments and numerical analysis. After the shear tests, the buckling instability, the post-buckling process and the failure mechanism of the specimen were obtained. The Finite Element(FE) models were established with the subsequent validation verification. A parametric analysis was implemented to study the influence of stringer thickness and stringer height on the behavior of the stiffened panels. The results show that after the initial local buckling on the skin, the buckling mode jumps several times with the increase of load. The stringers twist when the load reaches a certain level, and finally the structure damages due to the plastic deformation and the global buckling. The shear clip has little effect on the buckling and failure loads. Compared to the relatively large effect on the buckling load, the influence of the stringer thickness and stringer height on the failure load is neglectable.According to the parametric analysis, the stringer thickness influences the final buckling mode and failure mode, while the stringer height affects the buckling mode transformation. 展开更多
关键词 BUCKLING Finite Element Method(FEM) IN-PLANE shear loading Stiffened panel STRINGER HEIGHT STRINGER thickness Titanium alloys
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Testing Structure for Detection of Poly Stringer Defects in CMOS ICs
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作者 胡雄 潘伟伟 +2 位作者 史峥 严晓浪 马铁中 《Tsinghua Science and Technology》 SCIE EI CAS 2010年第3期347-351,共5页
A testing structure was developed to more effectively detect the poly stringer defects in contemporary CMOS ICs. This structure is much more sensitive to poly stringer defects and is closer to the real product layout ... A testing structure was developed to more effectively detect the poly stringer defects in contemporary CMOS ICs. This structure is much more sensitive to poly stringer defects and is closer to the real product layout than the currently widely used structure using an active dummy underneath a poly comb. Many testing structure pieces manufactured in a 0.11 μm copper process line were used to compare the current design with the conventional testing structure. The data shows that the new structure more efficiently detects poly stringers. The results also show that the poly stringers are related to the shallow trench isolation (STI) width. This structure can be used to identify new designs for manufacturing rules for the active space. Thus, this method is very useful for IC foundries to detect poly stringers and to characterize the processing line capability and tune the process recipe to improve product yields. 展开更多
关键词 poly stringer CMOS testing shallow trench isolation (STI)
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