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1.1 This test method covers the determination of the temperature at which an arbitrary deformation occurs when specimens are subjected to an arbitrary set of testing conditions.
1.2 This test method applies to molded and sheet materials available in thicknesses of 3 mm [1/8 in.] or greater and which are rigid or semirigid at normal temperature.
Note 1Sheet stock less than 3 mm [0.125 in.] but more than 1 mm [0.040 in.] in thickness may be tested by use of a composite sample having a minimum thickness of 3 mm. The laminae must be of uniform stress distribution. One type of composite specimen has been prepared by cementing the ends of the laminae together and then smoothing the edges with sandpaper. The direction of loading shall be perpendicular to the edges of the individual laminae.
1.3 The values stated in SI units are to be regarded as standard. The values given in brackets are for information only.
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Note 2The test method described as a Method B of this test method, and test methods Ae and Be of ISO 75-1 and ISO 75-2, 1993, are technically equivalent.
1.4 This procedure covers an alternate technique for measuring the net force that is applied to a deflection temperature specimen at midspan.
1.5 The net force is measured with the specimen support unit and loading assembly in place, that is, immersed in the heat-transfer medium.
1.6 This technique permits the user to account for discrepancies in the actual load applied to the specimen as a result of spring forces, friction, buoyancy, etc.
生产商• 美国Tinius Olsen• 意大利CEAST 熔体流动速率熔体体积流率测试仪热塑性塑料在规定的温度和负荷条件下,每10min通过标准口模,物质的量为熔体流动速率;体积的量为熔体体积流率。 单位:g/10minGB/T 3682-2000ISO 1133ASTM D 1238 简介• 热塑性塑料熔体质量流动速率和熔体体积流动速率与剪切速率有关。...
④试验跨度 当跨厚比增大时,各种材料均显示剪切力的降低,可见用增大跨厚比可减少剪切应力,使三点弯曲试验更接近纯弯曲。⑤温度 就同一种材料来说,屈服强度受温度的影响比脆性 强度的大。现行塑料弯曲性能实验的国家标准为GB/T9341-2008。三、冲击强度的测定冲击试验是用来度量材料在高速冲击状态下的韧性或对断裂的抵抗能力。...
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