Effect of Molecular Chain Structure on Fracture Mechanical Properties of Aeronautical Polymethyl Methacrylate Using Extended Digital Image Correlation Method

Shang, Wei; Yang, Xiaojing; Ji, Xinglong; Liu, Zhongxian

doi:10.1155/2016/1372413

Cited by 3 publications

(2 citation statements)

References 30 publications

(29 reference statements)

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“…In the case of PMMA sample, the fracture morphology is similar to that of the conventional material which exhibits brittle fracture behavior of indiscriminate crack propagation through the PMMA matrix. This accounts for lower K IC values for the conventional material and the PMMA matrix [50]. Figure 11c shows SEM micrographs were taken at high magnification for the fractured surface of the PMMA/HA 5 wt% composite samples.…”

Section: 6mentioning

confidence: 99%

Effect of hydroxyapatite filler concentration on mechanical properties of poly (methyl methacrylate) denture base

Aldabib¹,

Ishak

2020

SN Appl. Sci.

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Poly (methyl methacrylate) or PMMA is an acrylic material has been used widely as a denture base material. The denture base is subjected to various stresses during the function, these include tensile and flexural stresses. The current study was aimed to experimentally evaluate the effect of different filler concentrations on physical and mechanical characteristics of PMMA/HA composite. PMMA reinforced with different ratios (i.e. 0, 5, 10, and 15 wt%) of silane treated HA were prepared to study the effect of HA concentration on the mechanical properties of acrylic denture base material. Tensile, flexural and fracture toughness tests were conducted to evaluate the mechanical performance. The fracture surfaces of all the composites were studied using scanning electron microscopy. The hardness of the composite was investigated using Vickers hardness. Independent t-test was also conducted to evaluate the significant difference in the values measured as a function of different filler loading. Data analyses showed a significant improvement (P < 0.05) in the tensile and flexural modulus of the composite 26% and 27.3% respectively, as a result of increasing the HA loading to 15 wt%. However, no significant difference (P > 0.05) was detected in the tensile and flexural strength as function of HA incorporation. A small increment of only 1.63% and 3% in the tensile and flexural strength respectively, was achieved at very low filler loading i.e. 5 wt%. An improvement of only 7.8% in the surface hardness was observed for PMMA loaded with 15 wt% of HA.

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Section: 6mentioning

confidence: 99%

Effect of hydroxyapatite filler concentration on mechanical properties of poly (methyl methacrylate) denture base

Aldabib¹,

Ishak

2020

SN Appl. Sci.

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“…When the external force disappears, the system changes in the direction of increasing entropy, and the chain segments return to the curled state. In the process of the chain segment being straightened and returning to curl, the chain segment motion is damped as a result of the interactions between and within the molecular chains, and the equilibrium between the applied load and the occurring response cannot be reached instantaneously and takes some time to complete [23]. Therefore, the deformation of a material under the action of an external load depends on the rate of load.…”

Section: Stress-strain Curvesmentioning

confidence: 99%

Study on Mechanical Properties and Failure Mechanisms of Highly Filled Hydroxy-Terminated Polybutadiene Propellant under Different Tensile Loading Conditions

Wu,

Lu,

Jiang

et al. 2023

Polymers

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To study the mechanical properties of highly filled hydroxy-terminated polybutadiene (HTPB) propellant with 90 wt% solid fillers, the stress–strain curves of the propellant under different temperatures (−50 to 70 °C) and strain rates (0.000476 to 0.119048 s−1) were obtained by uniaxial tensile test. Moreover, to obtain the glass transition temperature and understand the effect of low temperatures on the mechanical properties of the propellant, DMA experiments were carried out. On this basis, the mechanical response laws of the propellant were analyzed, and the master curves of mechanical properties were established. Furthermore, the fracture features of the propellant under typical loading conditions were obtained by SEM, and the corresponding failure mechanisms were analyzed. The results show that the maximum strength decreases with increasing temperature, while the maximum elongation increases with increasing temperature at the same strain rate. The maximum tensile strength increases with increasing strain rate, while the maximum elongation decreases with increasing strain rate at the same temperature. The maximum tensile strength is lowest with a value of 0.35 MPa when the temperature is 343.15 K and the strain rate is 0.000476 s−1, at which time the maximum elongation reaches the highest with a value of 44%. In terms of failure mechanisms, the propellant shows no particle fracture, and the failure modes of the propellant are mainly matrix tearing and dewetting.

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Effect of cyclic wetting-drying on tensile mechanical behavior and microstructure of clay-bearing sandstone

Guo

Sangbong

et al. 2020

Preprint

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The understanding of the weakening mechanism of tensile strength of rock subjected to cyclic wetting-drying is critical for rock engineering. Tensile strength tests were conducted on a total of 35 sandstone specimens with different wetting-drying cycles. The crack propagation process and acoustic emission characteristics of the tested samples were obtained through a high-speed camera and acoustic emission system. The results indicate that the tensile strength is observably reduced after cyclic wetting-drying, and the extent of the reduction is not only related to the number of wetting-drying cycle, but also closely related to the clay mineral content of the sample. In addition, as the cycles of wetting-drying increase, the effect of each single cycle on tensile strength get reduced until it becomes constant.. Moreover, the crack initiation and penetration time is prolonged as the number of wetting-drying cycle increases, which indicates that cyclic wetting-drying weakens the rock stiffness and enhances the ductility of sandstone. Meanwhile, the acoustic emission characteristics of the tested samples further confirmed the ductile behaviour of the sandstone samples with increasing wetting-drying cycle. Furthermore, through the analysis of the microstructure and mineral composition of the samples with different wetting-drying cycles, it is concluded that the main weakening mechanisms of sandstones containing clay minerals are frictional reduction, chemical and corrosive deterioration.

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Effect of Molecular Chain Structure on Fracture Mechanical Properties of Aeronautical Polymethyl Methacrylate Using Extended Digital Image Correlation Method

Cited by 3 publications

References 30 publications

Effect of hydroxyapatite filler concentration on mechanical properties of poly (methyl methacrylate) denture base

Effect of hydroxyapatite filler concentration on mechanical properties of poly (methyl methacrylate) denture base

Study on Mechanical Properties and Failure Mechanisms of Highly Filled Hydroxy-Terminated Polybutadiene Propellant under Different Tensile Loading Conditions

Effect of cyclic wetting-drying on tensile mechanical behavior and microstructure of clay-bearing sandstone

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