1) grain boundary damage
晶界损伤
1.
Intergranular failure analysis of retaining ring steel 50Mn_(18)Cr_4 and explore for the essence of grain boundary damage;
护环钢50Mn_(18)Cr_4沿晶断裂分析及其对晶界损伤本质的探讨
2.
Effect of grain boundary damage on stress field of the crack tip;
晶界损伤对裂尖应力场的影响分析
2) Lattice damage
晶格损伤
1.
Investigation of Electro-Optic Properties and Lattice Damage Distribution of Ion Implanted Waveguides in Lithium Niobate;
离子注入铌酸锂光波导电光特性改变及晶格损伤分布研究
2.
Range distribution and lattice damage have been investigated using Rutherford backscattering and channelling technique in 350keV Yb ̄+-implanted Si(100).
用350keVYb~+在室温下注入了单晶硅,并用卢瑟福背散射/沟道技术测量了注入离子在硅中的射程分布谱和晶格损伤谱。
3.
The lattice damage in GsAs irradiated by 1MeV Si ̄(+) at room temperature and elevated substrate temperature has been investigated using Rutherford backscattering/channeling technique.
用卢瑟福背散射/沟道技术研究了1MeVSi ̄+在350℃高温和室温下以不同剂量注入GaAs后的晶格损伤。
3) crystal damage
结晶损伤
4) Lens lesion
晶体损伤
5) critical damage
临界损伤
1.
By the analysis and experiment measurement of damage condition of HK40 furnace tube, it was regarded that the damage material had critical damage cond ition at the tip of crack.
通过对服役材料HK40炉管损伤状态的实验测定和分析 ,认为在受损材料的裂纹前端存在临界损伤状态。
2.
The conditions and featwres of critical damage are firstly investigated for cement concrete in this paper.
本文分析了水泥混凝土临界损伤形成的条件和特点,进而,建立了重正化群模型和不动点方程;通过对损伤的规范化处理,求出了临界损伤面积密度,与经验值较吻合。
3.
In this thesis, the failure processes of concrete were studied, including the critical damage characteristics, the mechanism of damage-nucleation, and the damage modeling.
根据混凝土材料受载前初始损伤的分布、受载后微裂纹的萌生扩展及破坏后的断裂面表现出的分形特征,利用分形逾渗理论,结合混凝土损伤破坏的特点,建立了描述混凝土损伤演化的临界破坏模型,这一模型沟通了混凝土微细观损伤和宏观破坏之间的联系,并利用重正化群理论求得了混凝土损伤的临界概率、分形维数和临界损伤值。
6) interfacial damage
界面损伤
1.
Analysis of stress concentrations in cross-ply (hybrid) laminates taking into account interfacial damage;
计及界面损伤的复合材料正交(混杂)叠层板的应力集中分析
2.
Based upon both the existing results of stress concentration analysis and randomly enlarging critical-core theory,a statistical analysis of the ultimate tensile failure process in cross-ply(hybrid) laminates due to the interaction of the matrix cracking in 90 degree ply,interlaminated interfacial failure,fracture of some fibers in 0 degree layers and fiber/matrix interfacial damage was performed.
基于现有应力集中分析结果及随机扩大临界核统计理论,对正交(混杂)叠层复合材料中由于90°层的基体开裂、层间界面破坏、0°层中部分纤维断裂及纤维/基体界面损伤相互作用的最终拉伸破坏过程进行统计分析。
3.
Based on the shear-lag theory, a layering shear-lag model taking into account the interfacial damage was proposed and the stress redistributions for notched cross-ply laminates under tension were analyzed, from which both the length of the interfacial damage area and stress concentration factors in intact fibers at root of the notch were obtained.
基于剪滞理论,建立了一种计及界面损伤的分层剪滞模型,分析了含割口的正交叠层板在拉伸荷载作用下的应力重新分布问题,据此可求得界面损伤区长度和割口前缘完整纤维的应力集中因子。
补充资料:高温合金晶界强化
高温合金晶界强化
grain boundary strengthening of superalloy
gaowen heJ一n]Ingjleq旧nghuo高温合金晶界强化(grain boundarystrengthening of superalloy)添加微量元素改善晶界状态达到高温合金强化的目的。晶界的晶体结构不规则,原子排列混乱,晶格歪扭,又存在各种晶体缺陷(如位错、空洞等),因此晶界在高温变形时是一个薄弱环节。在高温蠕变时,晶界形变量占总形变量的5。%,因此强化晶界就成为高温合金强化的一个重要部分。一些有害杂质元素的溶解度很小且往往偏析于晶界,生成低熔点共晶化合物。硫在y一Fe中的溶解度只有0.015%。因此合金中所含的硫在铁中易形成熔点为988C的Fe十FeS低熔点共晶。硫在镍中会形成熔点只有644C的Ni+Ni3S:共晶。这些低熔点共晶在晶界的形成会大大恶化合金的热加工性能和高温热强性。通常高温合金中的硫含量控制在0.015%以下,优质高温合金控制在0.005%~。 .007写以下。美国宇航材料标准AMS228。规定镍基高温合金必须满足杂质控制标准,要求秘、佗、啼、铅、硒5个元素含量分别在(0.5~5)浓10一6以下,同时对锑、砷、锡、稼、锗、金、锢、汞、钾、钠、社、银、锡、铀、锌等15个微量杂质元素的含量分别控制在50x10一6以下,其总和还不允许超过4。。\10一6。为了消除有害杂质和气体的不利作用,进一步净化和强化晶界,可以加入一些微量元素,诸如硼、错、铅、镁、钙、钡、斓和饰等。硼在晶界偏聚,形成M3B:硼化物(见高温合金材料的间隙相)进行强化。硼能抑制晶界片层状、胞状析出相以及改善碳化物密集不均匀分布的状态,因而对热强性有利。铁、镍基高温合金中硼含量总在。.05%以下,通常控制在0.01%~。.02%左右。铸造高温合金中硼含量略高,一般可达。.02%一0.03%左右。错和硼有类似作用,但其效果不如硼大。镁是晶界偏聚元素,使晶界碳化物呈颗粒状分布,因而阻止沿晶裂纹的快速扩展,有利于热强性。镁使高温合金的蠕变第二阶段延长,第三阶段扩展,因而获得高的塑性和长的断裂寿命。由于镁使持久断裂塑性提高,可以大大改善持久缺口敏感性。镁还有去除杂质元素的洁净作用。镁、钙、钡、斓和柿等元素由于化学性活泼,与氧有很大的亲和力,可以在冶炼过程中起良好的脱氧去气作用,又能和一些低熔点杂质生成密度较小的难熔化合物,消除有害杂质在晶界的不利作用。这些微量元素的加人量都有一个最佳量,过量加入反而会使热强性下降。
说明:补充资料仅用于学习参考,请勿用于其它任何用途。
参考词条