ISO 1798 :1999弹性多孔聚合材料的拉伸强度与断裂伸长率
ISO 1798探讨了以恒定速率拉伸至断裂时，软质泡沫聚合材料的拉伸强度和变形性能.
原则上，试样夹紧在两个卡爪之间，并装有给定标距长度的引伸计。试样以恒定的位移速率被拉至断裂。测试过程中，记录载荷和应变用于确定拉伸强度和伸长量。为了记录测试结果，具有高速智能的测试数据采集速率非常重要。这需要与PC间的传输速率达到100Hz或更高来捕捉和记录所有数据。
对于此测试，采用覆有橡胶层夹面的 气动夹具 将材料夹紧在 拉伸试验机 上。尽管手动夹具也可以利用，但是由于使用方便、效率高和更好的可重复性，使用者更喜欢使用气动夹具。气动夹具可以设定预夹紧力的大小，而手动夹具的夹紧力大小取决于操作者的力量（可重复性差）。我们发现在这些测试中夹紧力和试样的对中非常重要。太大的压力会导致过早的断裂，而没有足够的夹持力可能会导致试样在钳口或者靠近钳口的地方打滑或者断裂。这些夹具通常适于单立柱或双立柱台式 试验机的设计。
应变测量有两种方法可以采用。接触式长行程引伸计贴在试样上。这包括一个适于确定试样的适当部分在长度方向上的相对变化的装置。另一种是 非接触式视频引伸计 可以作为一个观测装置，用于确定试样适当部分在长度方向上的相对变化。
我们建议使用如Bluehill(R) 2的材料测试软件来输入试样的详细数据，设定所需的控制，自动计算出所需的结果和统计数据，并得到完全符合标准的测试报告。
建议再次学习ISO 1798，以便在进行测试之前充分理解测试设备和结果要求。
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2630-080 Long Travel Extensometer
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Bluehill Universal Brochure
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