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1.
用于振动、冲击和噪声控制的SMA智能复合材料结构   总被引:8,自引:0,他引:8  
本文简要叙述SMA智能复合材料结构的基本概念,介绍其分析和求解的基本力学原理和方法,重点展示其在三个主要应用研究领域,包括振动控制、噪声控制及抗低速冲击的最新进展,并对存在问题和未来的发展给予评述.  相似文献
2.
复合材料板受低速冲击时能量吸收的实验研究   总被引:4,自引:0,他引:4  
魏俊  赵建华 《实验力学》1998,13(2):207-211
利用落锤装置,对玻纤/环氧和碳纤/环氧两种复合材料层合板进行了低速低能量的冲击实验研究。利用传感器技术记录了落锤冲击板过程中速度随时间变化曲线,计算了冲击动能和材料损伤时的能量吸收。通过数学处理得到了冲击载荷和冲击点位移随时间变化曲线。还对多次冲击的能量吸收问题进行了实验研究。  相似文献
3.
复合材料层合板的低速冲击损伤及其剩余压缩强度研究   总被引:2,自引:0,他引:2  
本文采用理论和实验方法研究了复合材料层合板的低速冲地及其剩余压缩强度。文中利用有限元方法和能量转换原理计算了层合板受到低速冲击的受载最危险状态,以及此时的应力分布;并用Tsai-Wu张量准则判断损伤情况,对产生损伤的单元进行相应的刚度折减,且作重复计算直至不产生新的损伤为止;最后,对受冲击的层合板还进行剩余压缩强度计算。在实验中,采用激光全息无损检测法测量了层合板的冲击损伤,并对受冲击的层合板进行  相似文献
4.
I. INTRODUCTION Composite materials have been used extensively in aerospace and other industries owing to the factthat they have high speci?c modulus, high speci?c strength, and the capability to be designed andfabricated with greater ?exibility, and ha…  相似文献
5.
双层夹芯复合材料结构横向冲击响应实验   总被引:1,自引:0,他引:1       下载免费PDF全文
采用玻璃纤维增强环氧树脂复合材料层合板作为内、外面板,以PVC泡沫作为芯材,构造了双层夹芯复合材料结构。采用落锤冲击实验,得到了冲击过程的撞击力历史;研究了在不同的冲击能量下,双层夹芯结构的冲击响应及内面板位置对双层夹芯结构冲击响应的影响。实验结果表明,内面板的引入及内面板的位置显著影响双层夹芯结构的撞击力历史,根据该撞击力历史可以优化设计出抗冲击性能优异的新型双层夹芯复合材料结构。  相似文献
6.
Improvement from the pseudo-elastic effect of shape memory alloy (SMA) on the low-velocity impact (LVI) resistance of a composite plate is investigated by the finite element method (FEM).The stiffness matrix of the dynamic finite element equation is established step by step and the martensite fraction is obtained at each time step.The direct Newmark integration method is employed in solving the dynamic finite element equation,while the impact contact force is determined using the modified Hertz's law.It is found that SMA can effectively improve the performance of a composite structure subjected to low-velocity impact.Numerical results show that the deflection of a SMA-hybrid composite plate has been reduced approximately by thirty percent when the volume fraction of the embedded SMA reaches 0.3.  相似文献
7.
In this paper we investigate impact and compression after impact properties of plain weave carbon fiber sandwich composites. Impact tests were conducted on different sample types to obtain information about absorbed energy and maximum impact force. The different samples consisted of foam-filled and hollow honeycomb cores with four-layer carbon fiber facesheets on one or both sides. The impact and compression after impact data provided valuable information to allow for comparisons between the different sample types. Also, the compression after impact tests were conducted in order to determine the reduction in compressive strength when comparing impacted to non-impacted samples. In conclusion, a two-degrees-of-freedom spring/mass model was compared to experimental results. The comparison helped illustrate the limitations of current impact theory. This paper was presented, in part, at a symposium honoring Dr Christian P. Burger, Novel Applications of Experimental Methods in Mechanics, held at the 2003 SEM Annual Conference and Exposition on Experimental and Applied Mechanics, June 2–4, 2003, Charlotte, North Carolina.  相似文献
8.
李念  陈普会 《力学学报》2015,47(3):458-470
针对复合材料层合板低速冲击损伤问题,提出了一种各向异性材料连续介质损伤力学模型,模型涵盖损伤表征、损伤起始判定和损伤演化法则3个方面.通过材料断裂面坐标下的损伤状态变量矩阵完成损伤表征,并考虑断裂面角度的影响,建立了主轴坐标系下的材料损伤本构关系.损伤起始由卜克(Puck)失效准则预测,损伤演化由断裂面上的等效应变控制,服从基于材料应变能释放的线性软化行为.模型区分了纤维损伤和基体损伤,并根据冲击载荷下层内产生多条基体裂纹继而扩展至界面形成层间裂纹(分层)的试验观察,引入基体裂纹饱和密度参数表征层间分层.以[03/45/-45]s和[45/0/-45/90]4s两种铺层的复合材料层合板为例,预测了不同冲击能量下复合材料层合板的低速冲击损伤响应参数,试验结果证明了连续介质损伤力学模型的有效性.模型在不同网格密度下的计算结果表明单元特征长度的引入可以在一定程度上降低损伤演化阶段对网格密度的依赖性.  相似文献
9.
In order to effectively describe the progressively intralaminar and interlam- inar damage for composite laminates, a three dimensional progressive damage model for composite laminates to be used for low-velocity impact is presented. Being applied to three-dimensional (3D) solid elements and cohesive elements, the nonlinear damage model can be used to analyze the dynamic performance of composite structure and its failure be- havior. For the intralaminar damage, as a function of the energy release rate, the damage model in an exponential function can describe progressive development of the damage. For the interlaminar damage, the damage evolution is described by the framework of the continuum mechanics through cohesive elements. Coding the user subroutine VUMAT of the finite element software ABAQUS/Explicit, the model is applied to an example, i.e., carbon fiber reinforced epoxy composite laminates under low-velocity impact. It is shown that the prediction of damage and deformation agrees well with the experimental results.  相似文献
10.
采用ABAQUS/Explicit有限元分析软件对碳纤维增强铝合金层合板(CARAL)受低速冲击进行 数值模拟,研究其在承载过程中的动力响应及损伤。首先通过具体算例与文献中的结果相比较,验证了方法 的有效性;其次从试件的脱层和吸能等抗冲击角度对CARAL 进行分析,并与传统的纯碳/环氧树脂胶片 (CFRP)进行抗冲击对比分析,结果表明,CARAL具有较好的抗冲击性能。  相似文献
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