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The effect of stacking sequence and fabrication on mode I, mode II fracture toughness of glass fiber reinforced unsaturated polyester resin composites

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Abstract
Glass fiber reinforced composites have been widely used as alternative materials for decades because of their better mechanical properties. Two types of glass fiber, chopped strand mat (M) and woven (W), were combined together by using unsaturated polyester resin (UPR) and different stacking sequence. Totally 6 stacking sequences were designed to investigate the effect of stacking sequence based on the tensile properties and fracture toughness as follows: [M4/M4], [W4/W4], [M4/W4], [M/W]4, [M/W/M/W]S, [W/M/W/M]S, and a Teflon film was inserted to the center layer as an initial crack during fracture test. The same stacking sequences were used to verify the optimum fabrication conditions such as vacuum, mixing with multi-walled carbon nanotubes (MWCNTs) into UPR. Several factors such as density, Young’s modulus, Poisson’s ratio and interlaminar fracture toughness of composites were calculated from the experiment data. From the result, the [W/M/W/M]S combination was founded to be the best stacking sequence based on these factors. Besides, the vacuum assistant and MWCNTs had a positive effect on fracture toughness in mode I and mode II tests. Consequently, the properly designed structure is recommended under different fabrication conditions.
Author(s)
구천
Issued Date
2019
Awarded Date
2019-08
Type
Dissertation
URI
https://oak.ulsan.ac.kr/handle/2021.oak/6335
http://ulsan.dcollection.net/common/orgView/200000219619
Affiliation
울산대학교
Department
일반대학원 기계자동차공학과
Advisor
염영진
Degree
Master
Publisher
울산대학교 일반대학원 기계자동차공학과
Language
eng
Rights
울산대학교 논문은 저작권에 의해 보호받습니다.
Appears in Collections:
Mechanical & Automotive Engineering > 1. Theses (Master)
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