复合材料圆筒中的应力波和破坏  

Stress Waves and Damage in Composite Tubes

作　　者：杨宇宙[1] 徐亚栋[1] 陈龙淼[1] YANG Yuzhou;XU Yadong;CHEN Longmiao(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China)

机构地区：[1]南京理工大学机械工程学院,江苏南京210094

出　　处：《火炮发射与控制学报》2022年第2期1-6,共6页Journal of Gun Launch & Control

基　　金：国家自然科学基金(51205206)。

摘　　要：当移动压力的速度接近一临界值时,应力波响应能够导致复合圆筒中的压力前缘位置瞬时产生很高的应变幅值和频率。作用时间很短的高强度应力波不会立即引起结构的失效,但是它能够加快复合圆筒中微缺陷的扩展,并缩短结构的疲劳寿命。对于结构各向异性、多重材料和以减重为目的设计的复合材料圆筒,共振引起的破坏尤其致命,因为多重材料层合结构界面处的剪切和拉伸强度较低,高温下材料属性下降,且加载速率对复合材料属性具有更大影响。所做的动态分析极大地克服了以往对于复合身管和管道系统设计、尤其减重设计时所作静态分析中的缺点,更符合现实应用场景。Stress wave response can result in very high instantaneous amplitude and frequency strains in a composite tubeat the pressure front,when the velocity of the moving pressure approaches a critical point.Short-duration high-intensity stress waves may not cause immediate structural failure,however,it could accelerate the propagation of initial flawsin a tube and shorten its fatigue life.For a composite cylinder designed for structural anisotropy,multiple materials and weight reduction,the damage caused by resonance is particularly destructive.That is because the shear and tensile strength at the interface of the multi-material laminated structure is low,material properties decrease at high temperatures,and the loading rate has a greater impact on the properties of composite materials.The dynamic analysis in this paper overcomes the shortcomings of the static analysis in the design of composite barrels and pi-ping systems,especially those in the weight reduction design.And it is more in line with real application scenarios.

关 键 词：复合圆筒 应力波 裂纹扩展 动态响应 

分 类 号：TJ399[兵器科学与技术—火炮、自动武器与弹药工程]