精品人妻一区二区三区四区在线_啊轻点内射在线视频_JUL一506人妻秘书汗中出_娇小1213╳yⅹ╳毛片

工程陶瓷材料可分為結構陶瓷和功能陶瓷兩大類，前者主要利用陶瓷機械性能。材料的力學性能主要研究材料在外力作用下發生彈性或塑性形變、材料抵抗形變的能力和材料失效或被 破壞的規律。陶瓷材料多以離子鍵、共價鍵，或者兩者的混合鍵結合。
從結構的特點來說, 這類晶體的剛性強，材料總體上硬度高、耐磨損、耐高溫和耐腐蝕，但是脆性大，塑性差，不易進行加工，抗熱震性也較差，強度分散。對這類材料施載時，內部或表面的裂紋容易擴展并將引起應力集中，使材料發生突然的災難性斷裂。
強度是材料抵抗變形和破壞的能力。根據加載形式的不同，材料內部的應力可歸納為三類：拉伸正應力，壓縮正應力和剪切應力。在這些應力作用下，材料破壞的強度分為拉伸強度、壓縮強度和剪切強度。另外，根據外加載荷特征分為彎曲強度，扭曲強度，沖擊強度和疲勞強度。（圖/文hytlfdc.com）
中譯英：
 Engineering ceramic materials can be divided into structural and functional ceramics two categories, the former mainly using ceramic mechanical properties. Mechanical properties of materials research materials under external force of elastic or plastic deformation, material to resist deformation capacity and material failure or destruction of. Ceramic material with ionic bond, covalent bond, or a mixture of both bond.

From the structural characteristics, this kind of crystal material on the whole rigidity, high hardness, wear resistance, high temperature resistance and corrosion resistance, but the brittleness, ductility, easy processing, thermal shock resistance is poor, intensity distribution. On this kind of material loading, inside or on the surface of the crack propagation easier and will cause stress concentration, so that a sudden catastrophic fracture of materials.