AerMet100—极好综合性能的超高强度钢

介绍了综合性能优良并有广泛应用前景的新型超高强度钢ＡｅｒＭｅｒ１００，与经超高强度钢相比，它具有更突出的综合性能；高强度、高硬度、高断裂韧性和延展性、优良的抗疲劳性能和抗应力开裂性能。     

两种增强泡沫塑料静动态力学性能的比较

通过静、动态压缩实验对两种增强聚氨酯泡沫塑料的压缩力学性能进行了研究，分析了两种材料应力－应变曲线的特点，并比较它们的应变率敏感性和动态加载时的能量吸收特性，实验结果表明：玻璃纤维束增强聚氨酯泡沫塑料具有不同于单丝玻璃纤维增强泡沫塑料的力学性能和变形破坏机制，单丝玻璃纤维增强泡沫塑料具有较好的增强效果。     

EBPVD法制备NiCrAlY/ZrO2-8Y2O3微层复合板的拉伸力学性能研究

采用电子束物理气相沉积(EBPVD)工艺制备了NiCrAlY／ZrO2—8Y2O3微层复合板，测试了该材料在不同温度下的拉伸力学性能，初步探讨了拉伸强度与延伸率随温度变化而变化的可能机理。结果表明：该材料的屈服极限、强度极限和最大延伸率均随温度的升高而降低，在室温时它是一种脆性材料而在高温时则是延性良好的塑性材料。     

金属基复合材料界面特征与力学性能

金属基复合材料的界面特征在很大程度上决定这种材料的性能。本文分析了金属基复合材料界面的特性，阐述了界面特性与力学性能之间的内在规律，利用二组元模型解释了界面上服性化合物厚度与力学。性能之间的数学联系。     

基于层合板基本性能数据的复合材料层合结构的强度校核方法

通过对[0/45]_8,[0/9]_8两种铺层的玻璃/环氧管状试样做双向载荷强度实验,发现基于层合板基本强度数据的Tsai—Wu准则失效包络线比基于单向板基本性能数据的失效包络线与实验结果的吻合要好得多。特别是按两个单轴强度比值做双轴强度实验确定相互作用系数,其强度曲线比选取相互作用系数F_(xy)~(?)=-1/2的方法与实验结果更为吻合。     

非连续增强镁基复合材料研究

采用液态浸渍法制备ＳｉＣ晶须和Ｂ４Ｃ颗粒混杂增强剂，成功地制备出增强剂含量为２４％的复合材料，并对材料的机械性能进行了测试，复合材料的抗拉强度达到了４１６ＭＰａ，弹性模量达到了８０ＧＰａ，较其基体材料分别提高了５３％和１１０％。对材料的断口分析表明，增强剂的均匀分布与晶须与基体之间的牢固结合，是复合材料具有较高机械性能的原因，而颗粒与基体界面间的开裂，以及基体共晶相的脆性开裂是复合材料塑性低的主要     

多向碳／碳复合材料超高温力学性能测试技术研究

本文系统地运用超高温力学性能测试的理论，通过对Ｇｌｅｅｂｌｅ－１５００热模拟实验机的改装，建立了高达２８００℃碳／碳复合材料加热、测控温、加载、数据采集和处理一体化的快速通电加热测试技术，着重介绍了各分系统改装的原理和方法。     

炭/环氧3D机织复合材料轴向和非轴向拉伸性能的实验研究

炭/环氧3D层-层正交角联锁机织复合材料是很有应用潜力的材料,但目前这种材料的力学性能数据较少,影响了其可靠性的评估。通过一系列的实验、分析,客观地评价了4种不同结构炭/环氧3D层-层正交角联锁机织复合材料沿0°、30°、45°、60°、90°方向的拉伸强度和拉伸模量。实验结果表明,4种材料均具有明显的正交各向异性特点,拉伸强度和拉伸模量的极值均出现在轴向,非轴向的拉伸强度和拉伸模量明显低于轴向值;带有衬经和衬纬结构的织物具有最佳的拉伸性能;4种材料的非轴向拉伸强度和拉伸模量彼此之间差异不是很大,拉伸过程伴随着剪切过程一同出现。     

Reloading partly recovers bone mineral density and mechanical properties in hind limb unloaded rats

Skeletal unloading results in decreased bone formation and bone mass. During long-term space flight, the decreased bone mass is impossible to fully recover. Therefore, it is necessary to develop the effective countermeasures to prevent spaceflight-induced bone loss. Hindlimb Unloading (HLU) simulates effects of weightlessness and is utilized extensively to examine the response of musculoskeletal systems to certain aspects of space flight. The purpose of this study is to investigate the effects of a 4-week HLU in rats and subsequent reloading on the bone mineral density (BMD) and mechanical properties of load-bearing bones.     

Influence of laser shock peening on surface integrity and tensile property of high strength low alloy steel

Laser Shock Peening (LSP) is a well-established surface treatment commonly used to improve mechanical properties of material's surfaces. To further understand the relationship between tensile property and fatigue life improvement of high strength low alloy steel in the LSP process, LSP treatment of 32CrNi high strength low alloy steel was carried out by YAG laser with pulse energy of 15 J, and tensile property was tested by electronic universal material testing machine. Surface morphology, residual stress and tensile fracture of the specimens before and after LSP were observed by white light interferometer (WLI), X-ray measuring apparatus and scanning electron microscope (SEM). Result shows that LSP did not change tensile strength of 32CrNi steel but cause yield characteristic transform from obvious yield point to no yield phenomenon which is the only factor benefiting fatigue life, indicating that the increment of fatigue life was probably related to the disappearance of yield phenomenon. Formation mechanisms of tensile fractures and yield phenomenon induced by LSP at room temperature were also discussed and completely revealed. Deeper compressive residual stress and flat grains contributed to the transition of yield characteristic and lower elongation rate of 32CrNi steel subjected to LSP.