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Factors influencing the tensile strength of carbon fiber reinforced plastic laminates for laser machining method and the underlined mechanisms
Journal of Laser Applications ( IF 1.7 ) Pub Date : 2020-11-01 , DOI: 10.2351/7.0000178
Yunxia Ye 1, 2 , Tingting Du 1, 2 , Haonan Li 1, 2 , Xudong Ren 1 , Haijuan Kong 3 , Naifei Ren 1
Affiliation  

This paper presents an investigation into the influence of laser drilling on the tensile strength of carbon fiber reinforced plastic (CFRP) laminates of 1 and 2.5 mm thickness. The CFRP laminates were drilled using the microsecond laser, nanosecond laser, and picosecond laser, and the heat-affected zone (HAZ) was characterized and measured by optical microscopy. Through setting laser parameters, specimens with different HAZs were prepared, and then tensile strength tests were conducted. The results indicate that the tensile strength linearly depends on the width of HAZ. The tensile strengths of 1 mm specimens decrease by approximately 122 MPa/mm HAZ, and 2.5 mm specimens decrease by approximately 33.9 MPa/mm HAZ. Comparing the results of different thicknesses of CFRP, the effect of HAZ on tensile strength would be weakened with the increasing of laminate’s thickness. Actually, besides HAZ, cutting-induced geometric defects also seriously influence tensile strength, because of the stress concentration around these defects during the stretching process. Additionally, the mechanism why the HAZ influences tensile strength was revealed visually through FEM simulation: the resin matrix damage within HAZ causes the tensile loads not be transferred effectively between the fibers and then weakens the strength. It was the first time the underlined mechanism is revealed for HAZ-inducing strength reduction through FEM simulation. The laser machining method is more suitable for processing the thicker CFRP composites because the negative effect of HAZ is weakened for the thicker material.

中文翻译:

影响激光加工碳纤维增强塑料层压板抗拉强度的因素及下划线机理

本文研究了激光钻孔对 1 和 2.5 毫米厚的碳纤维增强塑料 (CFRP) 层压板的拉伸强度的影响。使用微秒激光、纳秒激光和皮秒激光对 CFRP 层压板进行钻孔,并通过光学显微镜表征和测量热影响区 (HAZ)。通过设置激光参数,制备不同热影响区的试样,然后进行拉伸强度测试。结果表明抗拉强度与热影响区的宽度呈线性关系。1 mm 试样的拉伸强度降低约 122 MPa/mm HAZ,2.5 mm 试样的拉伸强度降低约 33.9 MPa/mm HAZ。比较不同厚度CFRP的结果,随着层压板厚度的增加,热影响区对拉伸强度的影响会减弱。实际上,除了热影响区之外,由于在拉伸过程中这些缺陷周围的应力集中,切削引起的几何缺陷也严重影响抗拉强度。此外,通过有限元模拟直观地揭示了 HAZ 影响拉伸强度的机制:HAZ 内的树脂基体损坏导致拉伸载荷无法在纤维之间有效传递,从而削弱强度。这是首次通过 FEM 模拟揭示了 HAZ 诱导强度降低的下划线机制。激光加工方法更适合加工较厚的 CFRP 复合材料,因为较厚的材料会减弱 HAZ 的负面影响。除了热影响区,由于在拉伸过程中这些缺陷周围的应力集中,切割引起的几何缺陷也严重影响抗拉强度。此外,通过有限元模拟直观地揭示了 HAZ 影响拉伸强度的机制:HAZ 内的树脂基体损坏导致拉伸载荷不能在纤维之间有效传递,从而削弱强度。这是首次通过 FEM 模拟揭示了 HAZ 诱导强度降低的下划线机制。激光加工方法更适合加工较厚的 CFRP 复合材料,因为较厚的材料会减弱 HAZ 的负面影响。除了热影响区,由于在拉伸过程中这些缺陷周围的应力集中,切割引起的几何缺陷也严重影响抗拉强度。此外,通过有限元模拟直观地揭示了 HAZ 影响拉伸强度的机制:HAZ 内的树脂基体损坏导致拉伸载荷不能在纤维之间有效传递,从而削弱强度。这是首次通过 FEM 模拟揭示了 HAZ 诱导强度降低的下划线机制。激光加工方法更适合加工较厚的 CFRP 复合材料,因为较厚的材料会减弱 HAZ 的负面影响。因为在拉伸过程中这些缺陷周围的应力集中。此外,通过有限元模拟直观地揭示了 HAZ 影响拉伸强度的机制:HAZ 内的树脂基体损坏导致拉伸载荷不能在纤维之间有效传递,从而削弱强度。这是首次通过 FEM 模拟揭示了 HAZ 诱导强度降低的下划线机制。激光加工方法更适合加工较厚的 CFRP 复合材料,因为较厚的材料会减弱 HAZ 的负面影响。因为在拉伸过程中这些缺陷周围的应力集中。此外,通过有限元模拟直观地揭示了 HAZ 影响拉伸强度的机制:HAZ 内的树脂基体损坏导致拉伸载荷不能在纤维之间有效传递,从而削弱强度。这是首次通过 FEM 模拟揭示了 HAZ 诱导强度降低的下划线机制。激光加工方法更适合加工较厚的 CFRP 复合材料,因为较厚的材料会减弱 HAZ 的负面影响。HAZ内的树脂基体损坏导致拉伸载荷不能在纤维之间有效传递,从而削弱强度。这是首次通过 FEM 模拟揭示了 HAZ 诱导强度降低的下划线机制。激光加工方法更适合加工较厚的 CFRP 复合材料,因为较厚的材料会减弱 HAZ 的负面影响。HAZ内的树脂基体损坏导致拉伸载荷不能在纤维之间有效传递,从而削弱强度。这是首次通过 FEM 模拟揭示了 HAZ 诱导强度降低的下划线机制。激光加工方法更适合加工较厚的 CFRP 复合材料,因为较厚的材料会减弱 HAZ 的负面影响。
更新日期:2020-11-01
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