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首页> 外文会议>Composites and Advanced Materials Expo >Modified Short Beam Shear Testing Methodology for Pultruded Unidirectionally Reinforced Composite Rods
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Modified Short Beam Shear Testing Methodology for Pultruded Unidirectionally Reinforced Composite Rods

机译：针刺单向增强复合杆的改造的短梁剪切测试方法

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The Short Beam Shear (SBS) test is commonly run as a quality check on pultruded rods. It is easy to run and does not require much sample preparation for testing beyond cutting the rod to length. Although it is fairly simple to set up and run unidirectionally-reinforced composite rods (URCRs) in an SBS configuration (ASTM D4475)~1, it can be very challenging to generate proper interlaminar shear stress (ILSS) failure modes~2. The data presented in this paper demonstrates the difficulties of obtaining proper ILSS failure modes (horizontal shear) with composite rods using the traditional ASTM D4475 3-point loading test configuration (Figure 1). Undesirable testing artifacts (e.g. fiber buckling on the compression surface) are routinely observed when testing URCRs using the traditional ASTM D4475 configuration~2. Failure that occurs via non-ideal pathways leads to artificially low ILSS values from 12-30% below achievable values depending on materials of construction and diameter of rods. The data collected in this study demonstrate that the PolyOne Advanced Composites (PAC) modified SBS method (even though it is clearly outside of the specifications of ASTM D4475) provides an improved alternative for testing ILSS of pultruded rods. Additionally, the use of the modified method results in the samples failing with the correct failure modes (horizontal shear), and the absence of testing artifacts such as compression buckling and localized crushing of the URCRs (Figures 2,3,9,10,13,16, and 19). Obtaining the correct failure modes in an SBS test has significant implications for testing in the pultrusion industry. One important implication is that producing the correct failure mode with the modified test method can be used to more effectively screen rods that have processing defects such as micro-voids, insufficient fiber wet-out, etc. The modified test method can be discriminatory, since any decline in shear-related properties can be attributed to the part and its processing, rather than testing artifacts.
机译：短梁剪切（SBS）测试通常是对拉挤杆的质量检查。它易于运行，并且不需要多种样品准备进行测试，以便在将杆切割到长度之外。尽管在SBS配置（ASTM D4475）〜1中设置和运行单向增强复合杆（URCR）进行了相当简单，但是产生适当的InterlaMinar剪切应力（ILSS）失效模式〜2可能非常具有挑战性。本文提出的数据展示了使用传统的ASTM D4475 3点加载试验配置获得具有复合杆的适当ILSS失效模式（水平剪切）的困难（图1）。当使用传统的ASTM D4475配置〜2时，在测试URCR时经常观察到不希望的测试伪影（例如压缩表面上的纤维弯曲）。通过非理想途径发生的故障导致人为低ILSS值，根据杆的施工和直径的材料，从而实现的12-30％。本研究中收集的数据表明，聚维式高档复合材料（PAC）改性SBS方法（即使它明显在ASTM D4475的规格之外）提供了一种改进的替代品，用于测试覆盖杆的ILSS。另外，使用修改的方法的使用导致使用正确的故障模式（水平剪切）的样本，以及不存在测试伪像，例如压缩屈曲和URCR的局部粉碎（图2,3,9,10,13 ，16和19）。在SBS测试中获得正确的故障模式对拉挤出行业的测试具有显着影响。一种重要的含义是，通过改进的测试方法产生正确的故障模式，可以使用更有效的筛选，所述筛棒具有如微空隙，纤维不足等的加工缺陷等。改性的测试方法可以是歧视的，从而可以是歧视性的，剪切相关性能的任何下降都可以归因于该部分及其处理，而不是测试伪影。

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