5 Considerations for ASTM D3039 Composite Tensile Testing

The ASTM D3039 testing methodology is a great choice for polymer matrix composite tensile testing because of its usability across a wide range of industries.

事实上，ASTM D3039由CMH17，前任MIL-HBK-17呼出，用于确定抗拉强度，模量和泊松比的设计允许值。

此外，ASTM D3039用作复合光纤外包装应用的质量控制工具。在这些应用中，在现场施加并固化复合超包，以进行地震加固的混凝土柱。复合拉伸试验提供了这些材料，即每种制造商的说明已经奠定并固化。

A Standard Born out of Necessity

Decades ago, producers of composite materials faced a problem. When it came time to test their products for strength and safety, the only available test methods were standards developed by and for the plastics industry. Various aerospace firms developed their own proprietary standards to meet their needs.

为了获得材料的拉伸性能，并向工业标准化工作，ASTM D30委员会开发了ASTM D3039，是聚合物乐动娱乐官网基质复合拉伸试验的共识标准。自20世纪70年代以来，该规范已成长为成为当今使用中最受欢迎的复合拉伸测试标准。

5 Considerations for Composite Tensile Testing per ASTM D3039

Before embarking on a testing program using the ASTM D3039 testing standard, there are a few considerations to make, including the type of material, panel thickness, specimen machining and tabbing, and proper test controls.

1.了解您的材料

ASTM D3039测试方法是特定于continuous high modulus, reinforced polymer matrix composites (that is to say, polymeric materials that contain reinforcing fibers, like carbon or aramid). Matrix materials include epoxies, bismaleimides (BMIs), polyamides, and thermoplastics such as PEEK.

If your material is discontinuously reinforced, ASTM D638 generally is a better suited test method. Likewise, ceramic matrix composite materials are generally tested to ASTM C1359, and metals to ASTM E8.

2.标本厚度

ASTM D3039测试标本通常由平面固化板加工。理想情况下，面板应在0.040英寸和0.200英寸之间，具体取决于上面。任何较厚的，并且样品可能在夹持区域或内部在达到材料的真正拉伸强度之前失效。任何稀释剂，标本都会受到环境因素的不必要的影响，如沿着夹具的表面应力。

3.制药加工

ASTM D3039检测标本的适当加工对于获得材料的结果，具有低散射至关重要。标本具有均匀的厚度横截面矩形。最佳做法是磨削每个标本的边缘以确保并行性和良好的表面光洁度。该标准需要小于64 rms，但元素通常获得少于20毫升。

While machining, it is important to be within 0.5 degrees of the fiber direction. Grinding specimens to thickness is not appropriate due to fiber path damage.

4. Tabbing of Test Specimens

为了实现复合抗拉强度的精确测定，量具必须具有几乎均匀的应力分布。结束标签的使用有助于以统一的方式将负载从夹具引入样本。标签并不总是需要甚至需要。通过仔细对准的液压夹具和适当的夹持表面，可以更有效地测试编织复合材料，90度带和+/- 45度的叠加而没有涡旋。零度胶带薄层标本最好用锥形突片进行测试。

Regardless of the tab type utilized, the test machine grips should extend past the end of the specimen tabs.

5. Test Alignment and Control

测试机器握把对准对于获得ASTM D3039测试的准确结果也是至关重要的。通常使用液压装载的夹具。用带9个应变计的杆调节并验证夹具的对准，确保负载纯度张力，而不弯曲。

应变可以用校准的扩展计或应变计测量。模量通常在1000至6000微米之间计算。双轴应变测量用于获得泊松比。

The entire load train may be heated or cooled in an environmental chamber so the tensile properties can be characterized from cryogenic temperatures up to the degradation temperature of the material.

最后的想法

选择您的材料的正确测试方法通常与您收到的结果一样重要。乐动娱乐官网具有材料类型，最终应用程序和测试要求的工作知识将有助于确保您选择正确的测试方法。如果您需要聚合物矩阵复合材料拉伸测试并正在考虑ASTM D3039测试方法，则认可的实验室可以帮助您提出知情决策，使您可以获得最有价值的见解。你对你的材料了解的越多，他们将越好地为你工作 - 多年来来乐动娱乐官网。