Damage evolution and energy dissipation of polymers with crazes

Min, Jie; Tang, Chak Yin; Li, Y. P.; Li, C. C.

doi:10.1016/s0167-8442(98)00002-0

Cited by 17 publications

(6 citation statements)

References 8 publications

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“…Although the precise formation mechanism of fibrils is still not fully understood, our experiments results indicate that the growth of fibrils is more favored in high crystallinity regions. Fibrils have been shown to provide a mechanism to dissipate energy [11] and stabilize a crack tip by bridging [12,13]. As the fibrils bridge the crack plane, they blunt the crack and shield the material ahead of the crack, preventing rapid crack propagation [9].…”

Section: Resultsmentioning

confidence: 99%

Reactions of Al-PTFE under Impact and Quasi-Static Compression

Bin

Fang

et al. 2015

Advances in Materials Science and Engineering

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Conventionally, the Al-PTFE is thought to be inert under quasi-static or static loads. However, here we reported an initiation phenomenon of Al-PTFE under quasi-static compression. Quasi-static tests suggest that reacted Al-PTFE samples had much higher toughness than unreacted samples. Dynamic test showed that the energy level needed to initiate the material was similar for quasi-static compression (88–100 J) and dynamic impact (77–91 J). The difference in density indicates that unreacted Al-PTFE has a higher crystallinity, which leads to the lower toughness. SEM images show numerous PTFE fibrils in unreacted composites which made the sample harder to crack and initiate.

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Section: Resultsmentioning

confidence: 99%

Reactions of Al-PTFE under Impact and Quasi-Static Compression

Bin

Fang

et al. 2015

Advances in Materials Science and Engineering

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“…Although the formation mechanism and precise structure of fibrils is still not clear, it is believed that the fibrils provide an additional resistance to crack propagation and enhance the ductility of the material. On the one hand, the formation of fibrils is an efficient mechanism to dissipate energy [31,32]; on the other hand, as the fibrils bride the crack surface, they can blunt the crack tip and slow down the propagation of crack [33,34].…”

Section: Fractographymentioning

confidence: 99%

Influence of Temperature on the Mechanical Properties and Reactive Behavior of Al-PTFE under Quasi-Static Compression

Wang

Fang

Bin³

et al. 2018

Polymers

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Al-PTFE (aluminum-polytetrafluoroethylene) is a typical kind of Reactive Material (RM), which has a variety of potential applications in weapon systems. In this paper, quasi-static compression experiments were carried out for a pressed and sintered mixture of Al and PTFE powders using a microcomputer-controlled electronic universal testing machine. The results show that both the mechanical property and reactive behavior of Al-PTFE are strongly temperature-dependent. The material undergoes a brittle-ductile transition associated with a temperature-induced crystalline phase transformation of the PTFE matrix. At low temperatures (−18, 0, and 16 • C), samples of Al-PTFE failed with shear crack and no reaction was observed. As the temperature increased (22, 35, and 80 • C), Al-PTFE exhibited a high toughness and violent reaction occurred in all of the tested samples. Scanning electron microscope observations showed different fracture mechanisms of the PTFE matrix and the increase in toughness was due to the formation of PTFE fibrils which could dissipate energy and bridge crack plane during plastic deformation.

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“…Failure of materials whose microstructure is made by a complex entangled chains network can be interpreted by applying different models, such as the fracture energy approach, the cavitation criterion, the craze dissipated energy approach, models based on the chains failure, on the deviatoric part of the stress tensor, on the strain energy density criterion, etc. Among them, the so‐called cavitation criterion has demonstrated to be suitable to physically explain the failure phenomenon in polymers when some conditions on the mechanical parameters and the failure hydrostatic pressure are fulfilled .…”

Section: Failure Of Stretchable Polymeric Materialsmentioning

confidence: 99%

Defect sensitivity of highly deformable polymeric materials with different intrinsic qualities at various strain rates

Brighenti

Carpinteri

Artoni

et al. 2017

Fatigue Fract Eng Mat Struct

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Highly deformable materials, such as elastomers and gels, can withstand very large deformation without failure, and this response is usually insensitive to the presence of macroscopic defects. These polymer‐based materials, different from the traditional ones which are usually characterized by an enthalpic elasticity, show a mechanical response which is governed by the state of internal entropy of their molecular network. If fracture energy is large, the noticeable ability of soft materials to rearrange their network at the microscale, to display large deformation and to dissipate energy thanks to their viscoelasticity, allows the minimization of the local detrimental effect of existing flaws. In the present paper, the mechanical behavior of silicone‐based edge cracked plates with different crack sizes and severity of the intrinsic flaws embedded in the material is examined by taking into account the time‐dependent effects. Experimental and theoretical aspects are discussed to explain the defect tolerance of such materials. The detrimental effect of intrinsic voids is quantified, and the beneficial effect due to strain at low rates is analysed. The critical distance is related to the ultimate stretch value, the quality of the material, and the crack size.

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Damage evolution and energy dissipation of polymers with crazes

Cited by 17 publications

References 8 publications

Reactions of Al-PTFE under Impact and Quasi-Static Compression

Reactions of Al-PTFE under Impact and Quasi-Static Compression

Influence of Temperature on the Mechanical Properties and Reactive Behavior of Al-PTFE under Quasi-Static Compression

Defect sensitivity of highly deformable polymeric materials with different intrinsic qualities at various strain rates

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