Ductile Fracture of Pure Copper : An Experimental and Numerical Study

Mirza, M. Saeed; Barton, D.C.; Church, P.; Sturges, John

doi:10.1051/jp4:19973150

Cited by 10 publications

(10 citation statements)

References 4 publications

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“…Then another specimen is tested by repeated loading and unloading at different plastic strain to get the change of E for corresponding strain. Seven numbers of independent specimens were also loaded upto 8,12,16,20,25,30, and 40% plastic strains and the tests were interrupted. These specimens were used to study the effect of strain on the void density by micro-structural observation using an optical microscope, SEM and Zeiss software.…”

Section: Tensile Deformation Of Flat Rectangular Specimen Without Anymentioning

confidence: 99%

“…In a study, Milza at al. [12] got that void nucleation and coalescence both have a very strong dependence on stress tri-axiality, but appear to be less sensitive to strain-rate for ductile material like pure copper. Osman [13] observed that due to presence of free graphite and nonspheroidal graphite in ductile cast iron, the fatigue crack initiate and propagates easily and the fatigue strength decreases.…”

Section: Introductionmentioning

confidence: 99%

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Micro void coalescence of ductile fracture in mild steel during tensile straining

Pradhan¹,

Robi²,

Roy³

2011

Frattura Ed Integrità Strutturale

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ABSTRACT. The ductile fracture occurs mainly in three stages i.e. void nucleation, void growth and the void coalescence. The present work focuses on the study the coalescence of existing micro void in a ductile material, mild steel. The specimen with holes in square array at various angle to load axis have been tested. The holes were machined in the specimen and assuming those hole as the voids. The growth and coalescence behaviours during tensile straining were observed both in macro and micro levels. Since the existing facility is not adequate to make hole size in micron, this work has been carried out by making hole upto 500 micron. The results are compared with other specimen with bigger size hole and without any hole. Also the effects of micro voids (present in the material) on the progress of crack have been studied. It is found that with same amount of voids, present in different positions, the mechanical properties of the material are altered.

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Section: Tensile Deformation Of Flat Rectangular Specimen Without Anymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Micro void coalescence of ductile fracture in mild steel during tensile straining

Pradhan¹,

Robi²,

Roy³

2011

Frattura Ed Integrità Strutturale

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“…Mirza et al [26] studied the influence of the stress triaxiality using copper specimens; they performed tensile tests stopped before failure in order to, once unloaded, polish them to observe the matrix inside the specimen and identify internal damage. They concluded that the stress triaxility plays a paramount role in how the nucleation-growth-coalescence mechanism develops.…”

Section: Influence Of Stress Triaxiality On Ductile Fracturementioning

confidence: 99%

“…Since its appearance, it has been often used to study fracture in ductile materials and is still a referent model in the field. The model is able to reproduce ductile fracture in many materials [26,62,63], has been compared with other models proving to be very precise [64] and has even been used to study cases of ductile-brittle damage transition [65].…”

Section: Gurson-like Modelsmentioning

confidence: 99%

Distinct Fracture Patterns in Construction Steels for Reinforced Concrete under Quasistatic Loading— A Review

Guerra

Gálvez

Cendón

et al. 2018

Metals

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Steel is one of the most widely used materials in construction. Nucleation growth and coalescence theory is usually employed to explain the fracture process in ductile materials, such as many metals. The typical cup-cone fracture pattern has been extensively studied in the past, giving rise to numerical models able to reproduce this pattern. Nevertheless, some steels, such as the eutectoid steel used for manufacturing prestressing wires, does not show this specific shape but a flat surface with a dark region in the centre of the fracture area. Recent studies have deepened the knowledge on these distinct fracture patterns, shedding light on some aspects that help to understand how damage begins and propagates in each case. The numerical modelling of both fracture patterns have also been discussed and reproduced with different approaches. This work reviews the main recent advances in the knowledge on this subject, particularly focusing on the experimental work carried out by the authors.

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“…Several ductile damage models have been developed over the years. One of the first works was carried out by Mirza et al [23]. They studied the influence of the stress triaxiality using copper specimens concluding that the strain triaxiality plays a fundamental role in the failure of metals.…”

mentioning

confidence: 99%

Experimental–numerical Calibration of the Fracture Locus of Weathering Steel

Concli

Maccioni

2019

Materials and Contact Characterisation IX

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Weathering steel, specifically Cor-Ten (or CORTEN) steel is a material particularly exploited in the last century for various outdoor applications, e.g. bridges, building facades, artworks etc. In addition to a tensile strength comparable with other construction steels, the natural oxide of this material, that is common rust, has the same specific volume as the metallic core. This ensures the adhesion of the oxidized protective layer as for aluminium. Therefore, the stable rust layer protects the raw material from further corrosion. This characteristic overcomes the need for painting and maintenance. These properties boost the exploitation of Cor-Ten in several civil applications, also where safety is a fundamental requirement, e.g. guard rails used, for example, in the South-Tyrolean region along the highways. With the aim of verifying or optimizing such safety applications, it is important to know the ductile behavior of the material. Indeed, during an impact, the main purpose of the structure is to absorb energy and this implies that large deformations will take place. Experimental quasi-static tests were performed on several sample geometries made of Cor-Ten. The same tests were also numerically reproduced, to retrieve the actual stress state, quantify the plastic strain at failure and calibrate a ductile damage model. The material model is based on both the classical incremental model of plastic response with isotropic hardening and the phenomenological concept of damage in continuum mechanics.

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Ductile Fracture of Pure Copper : An Experimental and Numerical Study

Cited by 10 publications

References 4 publications

Micro void coalescence of ductile fracture in mild steel during tensile straining

Micro void coalescence of ductile fracture in mild steel during tensile straining

Distinct Fracture Patterns in Construction Steels for Reinforced Concrete under Quasistatic Loading— A Review

Experimental–numerical Calibration of the Fracture Locus of Weathering Steel

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