Dynamic initiation and propagation behaviour of sub‐interfacial cracks in PMMA/aluminium bi‐material system

Yao, Xuefeng; Yeh, Hsien-Yang; Wang, Xu

doi:10.1111/j.1460-2695.2005.00960.x

Cited by 10 publications

(6 citation statements)

References 16 publications

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“…As for the friction welding, low stress destruction often occurred and welding defects are usually observed near the fusion zone and results in lower production efficiency. For a long time, failures of such joints have plagued Chinese turbocompressor makers [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of deep penetration laser welding of dissimilar metal Ni-based cast superalloy K418 and alloy steel 42CrMo

Liu

Pang

Zhang

et al. 2007

Optics and Lasers in Engineering

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Experimental trials of autogenous deep penetration welding between dissimilar cast Ni-based superalloy K418 and alloy steel 42CrMo flat plates with 5.0 mm thickness were conducted using a 3 kW continuous wave (CW) Nd:YAG laser. The influences of laser output power, welding velocity and defocusing distance on the morphology, welding depth and width as well as quality of the welded seam were investigated. Results show that full keyhole welding is not formed on both K418 and 42CrMo side, simultaneously, due to the relatively low output power. Partial fusion is observed on the welded seam near 42CrMo side because of the large disparity of thermal-physical and high-temperature mechanical properties of these two materials. The microhardness of the laser-welded joint was also examined and analyzed. It is suggested that applying negative defocusing in the range of Raylei length can increase the welding depth and improve the coupling efficiency of the laser materials interaction. r

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Section: Introductionmentioning

confidence: 99%

Characteristics of deep penetration laser welding of dissimilar metal Ni-based cast superalloy K418 and alloy steel 42CrMo

Liu

Pang

Zhang

et al. 2007

Optics and Lasers in Engineering

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“…Yao et al 49 studied the dynamic initiation and growth of sub‐interfacial cracks in a PMMA/aluminium bi‐material system using caustics. Figure 14 shows dynamic caustic patterns of sub‐interface crack propagation.…”

Section: Dynamic Fracture Of Complex Cracksmentioning

confidence: 99%

“…13 Off-focused caustic patterns of dynamic crack propagation in a PMMA specimen with two collinear cracks [46] . [49] . subjected to tensile loading, which indicates the interaction between the moving crack and the static crack by means of the evolution of dynamic fracture parameters, the variation of the caustic diameter and the distortion of the caustic shape due to the influence of local stress singularity at the crack tip.…”

Section: Dynamic Interaction Of Multi-cracksmentioning

confidence: 99%

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Recent application of caustics on experimental dynamic fracture studies

Yao

Wang

2011

Fatigue &Amp; Fracture of Engineering Materials &Amp; Structures

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A B S T R A C T Combining the caustic method with high-speed photography is an efficient optical measurement technique to study the dynamic fracture behaviours of homogenous and isotropic material. In the last decade, the main emphasis is extended to study dynamic fracture of anisotropic material and dynamic propagation of multi-cracks and interface cracks in practical engineering materials. In this paper, the recent advances and applications about the dynamic caustic method in China are reviewed, such as impact response and dynamic fracture of composite materials (fibre composites, functionally gradient materials and nanometre composites), and dynamic interaction and propagation of multicracks and interface cracks. Particularly, some new numerical methods were developed to solve the complicated caustic equations by introducing both the maximum characteristic size and the relevant angles in caustic patterns. Also, some important experimental results in fracture mechanics are described, and the potential research prospects about dynamic caustics are included as well.

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“…As for the friction welding, low stress destruction often occurred and welding defects are usually observed near the fusion zone, resulting in lower production efficiency. For a long time, failures of such joints have plagued Chinese turbo-compressor makers [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Transmission electron microscopy characterization of laser welding cast Ni-based superalloy K418 turbo disk and alloy steel 42CrMo shaft

Liu

Pang

Guo

et al. 2008

Journal of Alloys and Compounds

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Microstructure characterization is important for controlling the quality of laser welding. In the present work, a detailed microstructure characterization by transmission electron microscopy was carried out on the laser welding cast Ni-based superalloy K418 turbo disk and alloy steel 42CrMo shaft and an unambiguous identification of phases in the weldment was accomplished. It was found that there are ␥-FeCrNiC austenite solid solution dendrites as the matrix, (Nb, Ti) C type MC carbides, fine and dispersed Ni 3 Al ␥ phase as well as Laves particles in the interdendritic region of the seam zone. A brief discussion was given for their existence based on both kinetic and thermodynamic principles.

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Dynamic initiation and propagation behaviour of sub‐interfacial cracks in PMMA/aluminium bi‐material system

Cited by 10 publications

References 16 publications

Characteristics of deep penetration laser welding of dissimilar metal Ni-based cast superalloy K418 and alloy steel 42CrMo

Characteristics of deep penetration laser welding of dissimilar metal Ni-based cast superalloy K418 and alloy steel 42CrMo

Recent application of caustics on experimental dynamic fracture studies

Transmission electron microscopy characterization of laser welding cast Ni-based superalloy K418 turbo disk and alloy steel 42CrMo shaft

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