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Xu LR, Wang Q, Ni Y, Zhang G, Liu F, Zheng X, Liu Y. Significant Shear Failure Difference among Additively Manufactured Polymers Using Different Techniques. Polymers (Basel) 2022; 14:polym14194028. [PMID: 36235976 PMCID: PMC9572911 DOI: 10.3390/polym14194028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Revised: 09/09/2022] [Accepted: 09/20/2022] [Indexed: 11/16/2022] Open
Abstract
Because additively manufactured materials are increasingly being used in load-bearing structures, strength research has become critical. Surprisingly, numerous studies have reported the tensile strength measurements, but only a few studies have presented meaningful results for the shear strength measurements of additively manufactured polymers. Hence, this paper proposes a combined experimental and numerical investigation of a new interlayer shear strength measurement approach, and it targeted the applications of the same polyamide (PA12) specimens made with fused deposition modeling (FDM) and selective laser sintering (SLS). A necking-shaped shear specimen was developed to measure the pure shear strengths with the aid of a three-dimensional (3D) finite element analysis. The results showed that the specimens made with FDM and SLS exhibited totally different shear failure behaviors. The ultimate shear strength of the FDM-PA specimens had more than a 32% increase over that of the SLS-PA specimens. An interface mechanics assumption was employed to explore the different shear failure mechanisms with the support of a fractography analysis.
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Affiliation(s)
- Luoyu Roy Xu
- School of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, China
- MOE Key Laboratory of Impact and Safety Engineering, Ningbo University, Ningbo 315211, China
- Correspondence:
| | - Qinglin Wang
- School of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, China
| | - Yinxu Ni
- Zhejiang Key Laboratory of Additive Manufacturing Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315211, China
| | - Gonghe Zhang
- School of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, China
| | - Fenghua Liu
- Zhejiang Key Laboratory of Additive Manufacturing Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315211, China
| | - Xiaodong Zheng
- School of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, China
| | - Yang Liu
- School of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, China
- MOE Key Laboratory of Impact and Safety Engineering, Ningbo University, Ningbo 315211, China
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Nonlinear Impact Force Reduction of Layered Polymers with the Damage-Trap Interface. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12147078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
In this paper, a damage-trap material interface design of polymeric materials was proposed. Towards that, baseline and layered Polymethyl methacrylate (PMMA) and Polycarbonate specimens were fabricated with a Loctite 5083 adhesive layer between the interfaces. Out-of-plane impact experiments were conducted and found that the maximum impact force was reduced in layered polymers with so-called “damage-trap material interfaces”. At the impact energy of 20 J, the maximum impact force of the layered PMMA specimens with the 5083 adhesive was reduced by 60% compared to the identical specimens without any adhesive bonding. For the layered Polycarbonate specimens with the 5083 adhesive bonding, the maximum impact force was reduced by 20% and energy absorption was increased by 130%. Simplified contact mechanics analysis showed that the low Young’s modulus of the 5083 adhesive layers was a key parameter in reducing impact force and damage. Therefore, a simple and effective way to design layered materials with improved impact resistance was proposed.
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