Nondimensional simulation of influence of toughness of interface on tensile stress–strain behavior of unidirectional microcomposite

Ochiai, Shojiro; Hojo, Masaki; Schulte, Karl; Fiedler, Bodo

doi:10.1016/s1359-835x(00)00190-1

Cited by 24 publications

(9 citation statements)

References 25 publications

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“…Additionally, as the interlaminar shear properties (strength and stiffness) of the composite also suffer noticeably (Table 3), the stress transferability between the fibres will decrease as well. Although a weak interphase might be expected by shear lag theory to increase the fracture surface area [51], the opposite is found after hygrothermal ageing in the present study. One reason for this difference might be that shear lag theory is based on the assumption of a pure unidirectional fibre orientation, which is not the case for the composite investigated.…”

Section: Investigationcontrasting

confidence: 74%

Effects of Hygrothermal Ageing on the Interphase, Fatigue, and Mechanical Properties of Glass Fibre Reinforced Epoxy

Gibhardt

Doblies

Meyer³

et al. 2019

Fibers

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Reliability and cost-effectiveness represent major challenges for the ongoing success of composites used in maritime applications. The development of large, load-bearing, and cyclically loaded structures, like rotor blades for wind or tidal energy turbines, requires consideration of environmental conditions in operation. In fact, the impact of moisture on composites cannot be neglected. As a result of difficult testing conditions, the knowledge concerning the influence of moisture on the fatigue life is limited. In this study, the impact of salt water on the fatigue behaviour of a glass fibre reinforced polymer (GFRP) has been investigated experimentally. To overcome the problem of invalid failure during fatigue testing, an improved specimen geometry has been developed. The results show a significant decrease in fatigue life for saturated GFRP specimens. In contrast, a water absorption of 50% of the maximum content showed no impact. This is especially remarkable because static material properties immediately decrease with the onset of moisture absorption. To identify the water absorption induced damage progress, light and scanning electron microscopy was used. As a result, the formation of debondings and cracks in the fibre–matrix interphase was detected in long-term conditioned specimens, although no mechanical loading was applied.

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Section: Investigationcontrasting

confidence: 74%

Effects of Hygrothermal Ageing on the Interphase, Fatigue, and Mechanical Properties of Glass Fibre Reinforced Epoxy

Gibhardt

Doblies

Meyer³

et al. 2019

Fibers

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“…As will be shown later in section 3.1, in the textured Bi2223 filament, constituting of thin plate-shaped grains whose c-plane is parallel to the longitudinal direction, the transverse (perpendicular to the c-plane) fracture of the grains and longitudinal (parallel to the c-plane) fracture of the grain boundary occur. This kind of co-occurrence of transverse and longitudinal fractures has been observed in unidirectional fibre-reinforced composite materials, in which the stress-carrying component (fibre and matrix) shows transverse fracture and the interface between fibre and matrix shows longitudinal fracture [32][33][34][35][36]. The fracture process of such composites is characterized with inhomogeneous distribution of stress and damage (transverse and longitudinal fractures) as follows [34][35][36].…”

Section: Introductionmentioning

confidence: 95%

“…This kind of co-occurrence of transverse and longitudinal fractures has been observed in unidirectional fibre-reinforced composite materials, in which the stress-carrying component (fibre and matrix) shows transverse fracture and the interface between fibre and matrix shows longitudinal fracture [32][33][34][35][36]. The fracture process of such composites is characterized with inhomogeneous distribution of stress and damage (transverse and longitudinal fractures) as follows [34][35][36]. The spatial distribution of the stress is determined by the mechanical interaction among the spatially distributed damage.…”

Section: Introductionmentioning

confidence: 95%

A Monte Carlo–shear lag simulation of tensile fracture behaviour of Bi2223 filament

Ochiai¹,

Ishida²,

Doko³

et al. 2005

Supercond. Sci. Technol.

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The damage evolution in Bi2223 filaments and its influence on critical current was described by a Monte Carlo-shear lag simulation method. The experimentally observed zigzag crack propagation across aligned Bi2223 grains under tensile strain was effectively modelled by including transverse and longitudinal failure modes for individual grains. From the simulated stress-strain curve, the survival parameter (slope of the stress-strain curve normalized with respect to the original Young's modulus) was estimated with increasing applied strain. With this parameter combined with the strain sensitivity of the critical current, the measured change of critical current of the composite tape with applied strain could be described well.

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“…the material does not fail completely even if many microcracks occur at weak sites under applied load. Based on such design, composite materials and laminate materials have been developed [12,[14][15][16]. The crack-arrester type [17][18][19] shown in figure 2(a) is normally referred to as a lamella fracture, and it is widely reported in the literature as a method for enhancing toughness.…”

Section: Introductionmentioning

confidence: 99%

Shape effect of ultrafine-grained structure on static fracture toughness in low-alloy steel

Inoue

Kimura

Ochiai

2012

Science and Technology of Advanced Materials

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A 0.4C-2Si-1Cr-1Mo steel with an ultrafine elongated grain (UFEG) structure and an ultrafine equiaxed grain (UFG) structure was fabricated by multipass caliber rolling at 773 K and subsequent annealing at 973 K. A static three-point bending test was conducted at ambient temperature and at 77 K. The strength-toughness balance of the developed steels was markedly better than that of conventionally quenched and tempered steel with a martensitic structure. In particular, the static fracture toughness of the UFEG steel, having a yield strength of 1.86 GPa at ambient temperature, was improved by more than 40 times compared with conventional steel having a yield strength of 1.51 GPa. Furthermore, even at 77 K, the fracture toughness of the UFEG steel was about eight times higher than that of the conventional and UFG steels, despite the high strength of the UFEG steel (2.26 GPa). The UFG steel exhibited brittle fracture behavior at 77 K, as did the conventional steel, and no dimple structure was observed on the fracture surface. Therefore, it is difficult to improve the low-temperature toughness of the UFG steel by grain refinement only. The shape of crystal grains plays an important role in delamination toughening, as do their refinement and orientation.

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Nondimensional simulation of influence of toughness of interface on tensile stress–strain behavior of unidirectional microcomposite

Cited by 24 publications

References 25 publications

Effects of Hygrothermal Ageing on the Interphase, Fatigue, and Mechanical Properties of Glass Fibre Reinforced Epoxy

Effects of Hygrothermal Ageing on the Interphase, Fatigue, and Mechanical Properties of Glass Fibre Reinforced Epoxy

A Monte Carlo–shear lag simulation of tensile fracture behaviour of Bi2223 filament

Shape effect of ultrafine-grained structure on static fracture toughness in low-alloy steel

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