CAJ | 학술논문

对含有初始轴对称凹陷的圆柱壳在轴向载荷作用下的稳定承载能力进行了研究.首先,通过实验研究,得到了不同凹陷参数及不同壳长条件下的临界载荷.同时,不考虑凹陷成形过程,仅把凹陷部分当做结构的不规则变化时,对含有凹陷圆柱壳建立三维有限元模型进行稳定性分析.在分析中考虑了初始缺陷(圆柱壳成形加工中的不平直度、椭圆度、初始弯曲等因素引起)幅值f_0=0.1t和f_0=0.2t(t为壳体壁厚),得到了不同凹陷参数及不同壳长的临界载荷.结果表明:含有凹陷圆柱壳稳定承载能力对初始缺陷不太敏感,即:初始缺陷与凹陷相比,对稳定承载能力的影响极小.数值计算结果与实验结果吻合较好,共同给出了含有初始轴对称凹陷圆柱壳的承载能力随凹陷幅值、长度及圆柱壳长度的变化而改变的规律.
대함유초시축대칭요함적원주각재축향재하작용하적은정승재능력진행료연구.수선,통과실험연구,득도료불동요함삼수급불동각장조건하적림계재하.동시,불고필요함성형과정,부파요함부분당주결구적불규칙변화시,대함유요함원주각건립삼유유한원모형진행은정성분석.재분석중고필료초시결함(원주각성형가공중적불평직도、타원도、초시만곡등인소인기)폭치f_0=0.1t화f_0=0.2t(t위각체벽후),득도료불동요함삼수급불동각장적림계재하.결과표명:함유요함원주각은정승재능력대초시결함불태민감,즉:초시결함여요함상비,대은정승재능력적영향겁소.수치계산결과여실험결과문합교호,공동급출료함유초시축대칭요함원주각적승재능력수요함폭치、장도급원주각장도적변화이개변적규률.
Study of the stability and load-carrying capacity of a cylindrical shell with initial axisymmetric dent under uniform axial compression was carried out. Through experimental investigation, the critical loads for different dent lengths and different cylindrical shell lengths were obtained. At the same time, the dent was just regarded as an irregular change of whole structure regardless of the process of dent formation, a 3-dimensional finite element model was established to analyze the stability of cylindrical shell with initial dent. Taking into account the initial defects such as non-flatness, ellipticity and initial bending formed in fabrication, under the initial defect amplitudes f_0=0.1t and f_0=0.2t, respectively (t is the cylindrical shell thickness), the critical loads were obtained for different dent amplitudes, longitudinal lengths and cylindrical shell lengths. Results show that the effect of initial defect on the stability and carrying capacity of cylindrical shell with initial defects is inconspicuous relative to the initial dent. Experimental and numerical simulation results are in good agreement and both of them provide a regulation describing the relations among the load-carrying capacity and the dent amplitude and length and the cylindrical shell length.