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材料百科
材料百科A-Z之【P】
2020-11-20 02:11:21     浏览:61 次

Peel resistance. Torque required to separate an adhesive and adherent in the climbing drum peel test. (ASTM D-1781). It is a measure of bond strength.

抗剥离性。在爬鼓剥离试验中,分离粘合剂和附着物所需的扭矩。(ASTM D - 1781)。它是一种粘合强度的量度。


Peel strength. Measure of the strength of an adhesive bond. It is the average load per unit width of bond line required to part bonded materials where the angle of separation is 180 deg and separation rate is 6 in./min. (ASTM D-903).

剥离强度。粘结强度的测定方法。它是分隔粘合材料时粘合线每单位宽度所需的平均负荷,其中,分离角度为180度,分离率为 in./min.。(ASTM D - 903)。


Penetration. Depth to which the striker of a rebound pendulum penetrates a rubber specimen under conditions set in ASTM D-1054. It is an index of the dynamic stiffness or complex modulus of rubber specimens.

穿透度。根据ASTM D-1054规定的条件,回弹摆锤穿透橡胶试样的深度。它是橡胶试样动态刚性或复数模量的一个指标。


Permanent set. Extent to which a material is permanently deformed by a specified load. Usually expressed as % and calculated by dividing the difference in dimensions in the direction of loading before loading and after the load is removed by the original dimension and multiplying by 100.

永久变形。是指材料在一定负荷作用下永久变形的程度。通常用百分比表示,它等于负荷前和负荷后负荷方向上的维度差除以原维度,再乘以100计算。


Pfund hardness number (PHN). Measure of the indentation hardness of coatings. Hemispherical quartz or sapphire indentor is used. (ASTM D1474).

Pfund硬度值(PHN)。涂层压痕硬度的测定。采用半球形石英或蓝宝石压痕器。(ASTM D1474)。


Photoelasticity. Method for observing stress distribution in a part through the use of a transparent model.

光测弹性。采用透明模型观察局部应力分布的方法。


Pin test. Alternate term for expansion test.

插销试验。膨胀试验的另一个术语。


Plastic deformation. Deformation that remains after the load causing it is removed. It is the permanent part of the deformation beyond the elastic limit of a material. It also is called plastic strain and plastic flow.

塑性变形。是指消除导致材料变形的负荷后仍然存在的变形。它是超出材料弹性极限变形的永久部分。它也称为塑性应变和塑性流动。


Plasticity. Tendency of a material to remain deformed after reduction of the deforming stress to a value equal to or less than its yield strength.

可塑度。变形应力减小至等于或小于其屈服强度后材料依旧保持变形的趋势。


Plasticity number. Index of the compressibility of rubber at elevated temperatures. Equal to 100 times the height of a standard specimen after 3 to 10 min compression by a 5 kg load. (ASTM D-926).

塑性指数。橡胶在高温下的可压缩性指数。当材料在5公斤的负荷下压缩3至10分钟,其塑性指数等于标准试样高度的100倍。(ASTM D - 926)。


Plastometer test. Method for determining ability of rubber to be compressed at an elevated temperature and to recover at room temperature. Results are reported as plasticity number and recovery. Test differs from compressibility and recovery test in that the latter measures behavior of material subjected to short-time loading at room temperature.

塑性计检验。测定橡胶在高温下压缩和室温下恢复能力的方法。结果记录为塑性指数和恢复率。该检验不同于可压缩性试验和恢复率试验,后者可测量材料于室温下短时间承受负荷作用的性能。


Poisson’s ratio. Ratio of lateral strain to axial strain in axial loaded specimen. It is the constant that relates modulus of rigidity to Young’s modules in the equation: E = 2G (r + 1) where E is Young’s modulus; G, modulus or rigidity and r, Poisson’s ratio. The formula is valid only within the elastic limit of a material. A method for determining Poisson’s ratio is given in ASTM E-1321.

泊松比。轴向负荷试样的横向应变与轴向应变之比。它是将刚性模量与杨氏模量相关联的常数:E = 2G (r + 1),其中,E为杨氏模量; G为模量或刚性,r为泊松比。该公式仅在材料的弹性极限内有效。ASTM E-1321中给出了测定泊松比的方法。


Proof stress. Stress that will cause a specified permanent deformation.

弹性极限应力。会引起指定永久变形的应力。


Proportional limit. Highest stress at which stress is directly proportional to strain. It is the highest stress at which the curve in a stress-strain diagram is a straight line.Proportional limit is equal to elastic limit for many metals.

比例极限。是指应力与应变成正比的最大应力。它是应力应变图中曲线是一条直线的最大应力。就大部分金属而言,比例极限等于弹性极限。


Pusey and Jones indentation. Measure of indentation hardness of rubber. It is the depth of penetration of a ball indentor under a load applied by a plastometer. (ASTM D-531).

赵氏硬度。橡胶压痕硬度的量度。它是由塑化计施加负荷时,球形压痕器的穿透深度。(ASTM D- 531)。

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