Characterising the fracture toughness of polymers at moderately high rates of loading with the use of instrumented tensile impact testing

Visser, H.A.; Caimmi, Francesco; Pavan, A.

doi:10.1016/j.engfracmech.2012.09.024

Cited by 13 publications

(5 citation statements)

References 23 publications

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“…It is of crucial importance to pinpoint the force at which the crack growth initiates, in order to determine the fracture resistance of the specimen. Unfortunately, under even moderately high impact rates the forces acting on the specimen at the tip of the initial crack can be measured directly only by using techniques rather sophisticated such as caustics [9]. According to the results obtained in this study, kenaf fiber has appropriate properties to be used, in engineering, as fiber in fiber reinforced polymer composite sector.…”

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confidence: 76%

Impacted of Vacuum Bag Woven Kenaf/Fiberglass Hybrid Composite

Yunus

Salleh

Aznan

et al. 2014

AMM

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This paper discusses the mechanical properties of woven kenaf/fiberglass hybrid composites which has been fabricating using vacuum bag technique. Kenaf fiber had chosen among others natural fibres due to its excellent mechanical properties and potential natural raw fiber to replace plastic or tobacco in manufacturing a multitude of products for the construction, automotive, textile and advanced technology sectors. This study investigates post impact tensile of kenaf hybrid composites and its surface fractured. The impact energy used consists of 4J, 6J, 8J, 12J and 16J. The specimens were clamped between two plate rings with an internal hole diameter of 18mm and impacted with hemispherical nose impactor shape with diameter size of 12.7mm. The results revealed that this kenaf hybrid composite showed significant decreasing of strength and modulus as increasing the impact energy. The damage area affected with fiber fracture occurred much later in fracture process due to high bending stresses.

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confidence: 76%

Impacted of Vacuum Bag Woven Kenaf/Fiberglass Hybrid Composite

Yunus

Salleh

Aznan

et al. 2014

AMM

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“…In addition, it is important to determine the force that initiated the crack growth, since, at a shock load, the wave of stress passes through the specimen and destruction occurs when the critical stress is reached [15]. In turn, it would allow to determine the resistance to destruction of polymer materials and to evaluate the initiation and propagation of cracks after the impact loading.…”

Section: Methodsmentioning

confidence: 99%

Investigation of the Impact Strength of the Epoxy-Polyester Material for Using in Aggressive Environments in the Water Transport

Yakushchenko¹,

Brailo²,

Букетов³

et al. 2021

Komunikácie

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The influence of the aggressive environments of river water, seawater, oil petrol and sodium hydroxide on the impact strength of epoxy-polyester composite was investigated. Testing was conducted by two different methods. It was determined that the impact strength of specimens that were kept at air was W' = 4.2 kJ/m2 (by the second method - W'' = 7.0 kJ/m2). The energy spent on destruction of the control specimen was E = 0.92 J. The main regularities of the crack propagation process in the studied material were found and qualitatively described. The time of a crack propagation (τ = 0.16 μs) was determined. The maximum load, which leads to destruction of the specimen was P max = 2.47 kN. The comparative analysis of investigated specimens was conducted by the IR-spectroscopy method. It was found, that the biggest decrease in material properties was observed for the specimen that was kept in the petrol environment.

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“…[37][38][39] To describe the strength of the stress field at the crack tip, or to evaluate the ability of the materials with cracks to resist crack propagation under static loads, the critical stress intensity factor, K I , is more appropriate. [40,41] The fracture toughness (K IC ) is a constant for the material. When K I is larger than K IC , the crack will spread unstably and the fracture occurs quickly.…”

Section: Mechanical Performance Shielding and Optical Properties Of G...mentioning

confidence: 99%

Understanding the fracture toughness of gadolinium‐ and lead‐containing plexiglass

Zhang

Liu

et al. 2022

Polymer Engineering & Sci

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Toughened gadolinium‐ and lead‐containing plexiglasses (GLCPs) were prepared via copolymerization using ethoxylated bisphenol A dimethacrylate (BPAxEODMA, x = 2, 4, 10) as comonomer and network regulator. As‐obtained modified GLCPs possessed highly improved toughness, with satisfactory shielding and optical performances. The fracture mechanism was studied then in terms of fracture surface analyses. The results disclosed that both the impact strength and the fracture toughness (KIC) increased with the increase of fatty chain lengths or concentrations of BPAxEODMA, and the surface morphology strongly depended on the fracture processes. A morphological evolution, from mirror region to haze one, and finally to hackle region, was visible on all GLCP samples. However, the morphological characteristics of each region, such as size and roughness as well as the appearance of ring‐banded structure and firework‐like pattern, were completely different. The crack propagation mechanism was utilized to correlate the fracture surface morphology with fracture process of the samples. The relationship between KIC of the samples and their crosslinking networks was well‐built in this way. This work proposes valuable information around fabricating the anti‐radiation GLCPs with high and tailorable mechanical performance.

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Characterising the fracture toughness of polymers at moderately high rates of loading with the use of instrumented tensile impact testing

Cited by 13 publications

References 23 publications

Impacted of Vacuum Bag Woven Kenaf/Fiberglass Hybrid Composite

Impacted of Vacuum Bag Woven Kenaf/Fiberglass Hybrid Composite

Investigation of the Impact Strength of the Epoxy-Polyester Material for Using in Aggressive Environments in the Water Transport

Understanding the fracture toughness of gadolinium‐ and lead‐containing plexiglass

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