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4.1 This test method is intended for tensile testing of fiber-reinforced thermosetting laminates. For injection molded thermoplastics, both reinforced and unreinforced, Test Methods D638 is recommended. For most unidirectional fiber reinforced laminates, Test Methods D3039/D3039M is preferred.
4.2 This test method is designed to produce tensile property data for quality control and research and development. Factors that influence the tensile properties, and should therefore be reported, are: material, methods of material and specimen preparation, specimen conditioning, test environment, speed of testing, void content, and volume percent reinforcement.
4.3 It is realized that a material cannot be tested without also specifying the method of preparation of that material. Hence, when comparative tests of materials per se are desired, the greatest care must be exercised to ensure that all samples are prepared in exactly the same way, unless the test is to include the effects of sample preparation. Similarly, for referee purposes or comparisons within any given series of specimen, care must be taken to secure the maximum degree of uniformity in details of preparation, treatment, and handling.
Note 6: Preparation techniques for reinforced thermosetting plastics can be found in the part of ISO 1268 appropriate to the manufacturing technique for the laminate.
4.4 Tensile properties may provide useful data for engineering design purposes. However, because of the high degree of sensitivity exhibited by many reinforced plastics to rate of straining and environmental conditions, data obtained by this test method cannot be considered valid for applications involving load-time scales or environments widely different from those of this test method. In cases of such dissimilarity, no reliable estimation of the limit of usefulness can be made for most plastics. This sensitivity to rate of straining and environment necessitates testing over a broad load-time scale (including impact and creep) and range of environmental conditions.
Note 7: Since the existence of a true elastic limit in plastics (as in many other organic materials and in many metals) is debatable, the propriety of applying the term “elastic modulus” in its quoted generally accepted definition to describe the “stiffness” or stress-strain characteristics of plastic materials is highly dependent on such factors as rate of application of stress, temperature, previous history of specimen, etc. However, stress-strain curves for plastics, determined as described in this test method, almost always show a linear region at low stresses. A straight line drawn tangent to this portion of the curve permits calculation of an elastic modulus of the usually defined type. Such a constant is useful if its arbitrary nature and dependence on time, temperature, and similar factors are realized.
4.5 For many materials, there may be a specification that requires the use of this test method, but with some procedural modifications that take precedence when adherin......
、 拉伸模量 、泊松比试样非连续或连续性纤维增强复合材料（高模量）带或不带加强片试样均可试样层压板相对于测试方向是平衡和对称夹具楔形拉伸夹具备注可配合使用应变片/引伸计ASTM D1781滚筒剥离胶粘剂标准试验方法标准粘合强度试验目的W76.2 × L305(mm)试样滚筒剥离试验夹具夹具标准ASTM D695硬质塑料压缩性能的标准试验方法试验目的抗压强度、抗压屈服点、模量试样未增强和增强塑料的直圆柱体或棱柱体长度是其主宽度或直径的两倍...
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