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This test method covers the determination of the tensile properties of unreinforced and reinforced plastics in the form of standard dumbbell-shaped test specimens when tested under defined conditions of pretreatment, temperature, humidity, and
testing machine speed.
1.2 This test method can be used for testing materials of any thickness up to 14 mm (0.55 in.). However, for testing specimens in the form of thin sheeting, including film less than 1.0 mm (0.04 in.) in thickness, Test Methods D 882 is the
preferred test method. Materials with a thickness greater than 14 mm (0.55 in.) must be reduced by machining.
1.3 This test method includes the option of determining Poisson’s ratio at room temperature.
试样形状及尺寸
标准中规定使用四种类型的试样,1,11, III 型为哑铃形试样。见图1~图3。工V型为长条型试样,宽度
10^25二,总长度不小于150二,标距至少为50 mm,见附图详细标注:
拉伸曲线 示例
哑铃型标准样条 图1
图2
图3[ Last edited by javas2010 on 2012-2-26 at 18:01 ] |