Tensile Strength – is an expression of the maximum capacity of a particular material to stretch under tension load, prior to failure.
Its normally expressed in 其通常表示為:
單位: Pounds/Tons – Inch terms 磅/噸
Kilo Newton (KN) – Metric terms 千牛
Yield Stress (Yield point) – is an expression of the theoretical point of stress (pressure) beyond which the material loses its elasticity and becomes permanently stretched.
屈服應(yīng)力（屈服點(diǎn)）--是材料由彈性變形轉(zhuǎn)變?yōu)樗苄宰冃螘r(shí)的應(yīng)力
Its normally expressed in其通常表示為:
單位:lbf / in – Inch terms 磅/英寸
N/mm^2 – Metric terms 牛/平方毫米
Proof Load Stress – is an expression of the minimum stress a material must achieve, prior to permanent elongation and, the stress which would be applied to test and re-measure a specific fastener to prove it had not permanently stretched and that it will carry the required load
彈性極限應(yīng)力—是材料塑性變形前必須達(dá)到的最小應(yīng)力，此應(yīng)力應(yīng)通過測(cè)試或用指定的緊固件加載來證明塑性變形前可達(dá)到的載荷。
Its normally expressed in 其通常表示為
單位:lbf / in – Inch terms
N/mm^2 – Metric terms
Approximately between 80% and 90% of the theoretical yield stress 此值大約為理論屈服應(yīng)力的80%到90%
Ultimate Tensile Stress – is the theoretical minimum point at which the material will fracture. It is expressed in the same terms as yield stress and proof load stress.
極限抗拉應(yīng)力—是材料斷裂的理論最小值。它可與屈服應(yīng)力及彈性應(yīng)力同時(shí)表述
These properties are used to calculate the Proof load and breaking load for each diameter of each grade or class of product.
這些參數(shù)用來計(jì)算不同直徑、等級(jí)緊固件的標(biāo)準(zhǔn)載荷及破壞載荷
Its normally expressed in 其通常表示為
單位 : Pounds force – Inch terms
Kilo Newton (KN) – Metric terms
Fatigue Strength – is the maximum stress a fastener can withstand for a specified number of repeated cycles prior to its failure.
疲勞強(qiáng)度– 緊固件對(duì)規(guī)定次數(shù)循環(huán)而不破壞的最大應(yīng)力
Torsional Strength – is a load usually expressed in terms of torque, at which the fastener fails by being twisted of about its axis.
抗扭強(qiáng)度—緊固件可承受的軸線方向的扭矩
Hardness – is a measure of material’s ability to resist abrasion and indentation. For carbon steels, Brinell and Rockwell hardness testing can be used to estimate tensile strength properties of fasteners.
硬度—用于表征材料對(duì)抗磨損和劃痕的能力。對(duì)于碳鋼，布氏和洛氏硬度可以用來估計(jì)緊固件的抗拉強(qiáng)度
Ductility – is a measure of the degree of plastic deformation that has been sustained at fracture. In other words, it is the ability of material to deform before it fractures.
延展性—用來衡量材料到破壞為止的塑性變形程度。換言之，也是材料在破壞之前可變形的能力
Toughness – is defined as a material's ability to absorb impact or shock loading. Impact strength toughness is rarely a specification requirement.
剛性—用來定義材料吸收沖擊或振動(dòng)載荷的能力。沖擊強(qiáng)度剛性是很少見的規(guī)范要求。
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