摘要：This paper presents a design theory and dynamic mechanical characterizations of the composite tape-spring hinge made by two parallel single tape ***,the theoretical models of moment-rotation angle on anisotropy tape springs with antisymmetric laminates are ***,the relationships of moment-rotation angle for tape-spring hinges with different sizes are simulated and analyzed by means of the finite element method (FEM),which is in good agreement with the results from theoretical ***,the dynamic vibration analysis for deployable composite tube hinges with different dampings is done during the process of deployment.

摘要：Over the past decade,multistable mechanical metamaterials have been widely investigated because of their novel shape reconfigurability and programmable energy *** ability to reversibly reshape among diverse stable states with different energy levels represents the most important feature of the multistable mechanical *** summarize main design strategies of multistable mechanical metamaterials,including those based on self-assembly scheme,snap-through instability,structured mechanism and geometrical frustration,with a focus on the number and controllability of accessible stable *** we concentrate on unusual mechanical properties of these multistable mechanical metamaterials,and present their applications in a wide range of areas,including tunable electromagnetic devices,actuators,robotics,and mechanical logic ***,we discuss remaining challenges and open opportunities of designs and applications of multistable mechanical metamaterials.

摘要：A mechanical metamaterial that has a tailorable coefficient of thermal expansion(CTE)is promising for guaranteeing the reliability of electrical and optical instruments under thermal *** growing research on the design and manufacturing of metamaterials with extraordinary CTEs,it remains challenging to achieve a nearly isotropic tailorable CTE while ensuring a sufficient load bearing capacity for applications,such as mechanical supporting *** this research,we propose a type of bi-metallic lattice whose CTE is artificially programmed from positive(75 ppm/K)to negative(−45 ppm/K),and whose equivalent modulus can be as high as 80 *** bi-metallic lattice with a tailorable CTE in two orthogonal directions can be readily assembled without special modifications to construct large-scale planar structures with desired isotropic CTEs.A theoretical model that considers the actual configuration of the bi-metallic joint is developed;the model precisely captures the thermal deformations of lattice structures with varied geometries and material *** by our theoretical design method,planar metallic structures that were manufactured using Al,Ti,and Invar alloy were experimentally characterized;the structures exhibited outstanding performance when compared with typical engineering materials.

摘要：压电复合材料的有效性质是一个十分重要的问题·在分析了一无限大均匀线性非压电介质中含有一个横观各向同性球形压电夹杂问题的基础上，导出了夹杂内的约束应变场和约束电场的解析表达式，进而得到了含横观各向同性球形压电夹杂的压电复合材料的有效电弹模量的稀疏解·本文结果可以用于压电复合材料或智能材料和智能结构的设计与分析·

摘要：为考查混合连接结构的力学性能,设计了两种不同形式的样件,通过试验研究了混合连接结构压缩与弯曲性能.结果发现:轴向压缩试验中点阵夹芯结构是连接结构的薄弱环节,芯材剪切引发的脱胶破坏与面板压皱都会引发结构失稳;面板分层是三点弯曲试验中连接结构的主要破坏模式,均发生在结构刚度突变位置,而支座反力的作用会导致点阵树脂基座的破裂,进一步引发脱胶破坏.

摘要：为考查芯材拼接对舰船复合材料天线罩夹芯板力学性能的影响,设计系列试验对比研究芯材拼接对夹芯板的极限承载能力、复杂稳定性和破坏模型的影响.结果发现:芯材拼接主要影响结构的破坏模式和破坏载荷;极限承载试验中芯材拼接易诱发分层破坏,进而导致蒙皮拉伸断裂,且使承载极限降低11.5%;复杂稳定性试验的主要破坏模式为贯穿型和局部型蒙皮压缩破坏,芯材拼接对破坏模式的影响表现为破坏位置的差异,且复杂屈曲载荷降低28.6%;工艺的复杂化使夹芯板力学性能的离散性升高.

摘要：水密舱壁破损是反舰导弹舱内爆炸作用下舰艇多舱进水沉没的重要原因。开展了舱内爆炸作用下方形板的失效模式的试验研究,进行了数值仿真分析,结合应力状态、应力变化和塑性变形特性分析了有无变形协调装置时舱壁的失效机理,在不明显增加结构重量的前提下提出了一种基于变形协调机制的高性能抗破损设计,讨论了不同半径的变形协调装置对舱壁抗破损能力的增强作用,结合梁变形理论分析了边缘破损的主要机制。研究结果表明:(1)边缘拉伸失效是舱内爆炸作用下舱壁的主要破坏模式;(2)设置边缘变形协调装置能有效提高舱壁在准静态气压作用下的抗破损能力;(3)提高变形协调装置半径能有效降低最大塑性变形并调整塑性变形集中区域的分布;(4)边缘变形协调装置提高舱壁抗破损能力的主要原因是提高了边缘的曲率变形,降低了局部弯曲正应力。

摘要：纤维缠绕复合材料压力容器(COPV)由于其轻质高强及先漏后爆等特性在航空航天、路面交通和石油化工等领域得到广泛应用。基于纤维缠绕工艺的特点,提出了一种新型无焊缝连接金属内衬COPV结构及其制备工艺。并通过缠绕工艺及在封头直边设置密封槽,解决了内衬的封头与筒体之间的连续性和密封性问题。基于该结构的特点,一种辅助成型工装被发明,成功实现了这种新型内衬结构的缠绕成型问题。之后,通过液压试验验证了该结构的可行性,该新型容器能够承受110 MPa的爆破设计压力。进一步对容器剖面进行宏观分析,获得了该结构的三种损伤模式。最后,基于Chang-Chang失效准则及层间内聚力失效模型,通过编写用户子程序VUMAT建立了该新型结构的有限元计算模型,确定了分层损伤为该结构的主要损伤模式及位于封头与筒身过渡区的纤维拉伸断裂为该结构的主要失效模式。

摘要：为改进传统单向波纹夹层结构横向力学性能较差的缺点,设计了一种新型复合材料双向波纹夹层结构。考虑复合材料双向夹层结构制备困难,研究了整套真空辅助成型工艺(VARI)工艺制备方案,实现双向波纹夹层结构的高效制备,以满足工程应用的需要。对制备出的复合材料双向波纹夹层结构与单向波纹夹层结构分别进行面外压缩、弯曲和剪切实验,分析了双向波纹夹层结构在不同载荷下的破坏模式及其失效机制,计算了该结构在不同荷载条件下的强度和模量,并将其与单向波纹夹层结构进行对比分析。结果表明,在压缩荷载作用下,玻璃纤维/环氧树脂芯子为主要承载部分,结构的失效主要体现在芯子的屈曲、断裂和分层;在弯曲荷载的作用下,由于纤维的抗压强度远小于抗拉强度,所以压头下方的上面板最先达到破坏荷载,结构的弯曲失效形式主要为上面板的断裂和脱粘;结构的剪切失效主要以泡沫与面板的脱粘和压溃为主,芯子和面板未见明显的破坏现象;与单向波纹夹层结构相比,双向波纹夹层结构力学性能显著提升。

摘要：蜂窝材料具有优异的抗冲击吸能特性.为进一步提高蜂窝材料的比吸能与压缩力效率,提出了一种几何参数或材料参数沿厚度方向梯度渐变的蜂窝材料模型,并针对六边形蜂窝构型研究了胞元壁厚和屈服强度梯度变化的蜂窝材料在面外动态压缩载荷下的力学行为与吸能特性.研究结果表明,通过调控梯度变化的指数,胞元壁厚或母体材料屈服强度的梯度设计均可有效降低初始峰值应力,并使蜂窝材料的比吸能和压缩力效率同时增大.研究结果可为蜂窝材料的防撞性优化设计提供新的思路.