Experimental study on the process of adiabatic shear fracture in isolated segment formation in high-speed machining of hardened steel

Li, Gu; Wang, Minjie; Chen, Hui; Kang, Guozheng

doi:10.1007/s00170-015-8157-0

Cited by 13 publications

(4 citation statements)

References 16 publications

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“…There are four failure modes under the impact loads: local large deformation (Gao et al. , 2017), adiabatic shear failure caused by temperature change (Gu et al. , 2016), collapse damage caused by the interaction of stress waves (Fitzgerald et al.…”

Section: Introductionmentioning

confidence: 99%

Evaluation and prediction of material fatigue characteristics under impact loads: review and prospects

Liu

et al. 2022

IJSI

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PurposeThe properties of materials under impact load are introduced in terms of metal, nonmetallic materials and composite materials. And the application of impact load research in biological fields is also mentioned. The current hot research topics and achievements in this field are summarized. In addition, some problems in theoretical modeling and testing of the mechanical properties of materials are discussed.Design/methodology/approachThe situation of materials under impact load is of great significance to show the mechanical performance. The performance of various materials under impact load is different, and there are many research methods. It is affected by some kinds of factors, such as the temperature, the gap and the speed of load.FindingsThe research on mechanical properties of materials under impact load has the characteristics as fellow. It is difficult to build the theoretical model, verify by experiment and analyze the data accumulation.Originality/valueThis review provides a reference for further study of material properties.

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Section: Introductionmentioning

confidence: 99%

Evaluation and prediction of material fatigue characteristics under impact loads: review and prospects

Liu

et al. 2022

IJSI

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“…Segment sliding, as observed in Fig. 5(d), further increases the cumulative shear strain due to friction generated between the two sliding surfaces [38,39].…”

Section: Analysis Of Digital Image Correlation Resultsmentioning

confidence: 71%

Study of the Shear Strain and Shear Strain Rate Progression During Titanium Machining

Davis

Dabrow

Ifju

et al. 2018

Journal of Manufacturing Science and Engineering

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Machining is among the most versatile material removal processes in the manufacturing industry. To better optimize the machining process, the knowledge of shear strains and shear strain rates within the primary shear zone (PSZ) during chip formation has been of great interest. The objective of this study is to study the strain and strain rate progression within the PSZ both in the chip flow direction and along the thickness direction during machining equal channel angular extrusion (ECAE) processed titanium (Ti). ECAE-processed ultrafine-grained Ti has been machined at cutting speeds of 0.1 and 0.5 m/s, and the shear strain and the shear strain rate have been determined using high speed imaging and digital image correlation (DIC). It is found that the chip morphology is saw-tooth at 0.1 m/s while continuous at 0.5 m/s. The cumulative shear strain and the incremental shear strain rate of the saw-tooth chip morphology can reach approximately 3.9 and 2.4 × 103 s−1, respectively, and those of the continuous chip morphology may be approximately 1.3 and 5.0 × 103 s−1, respectively. There is a distinct peak shift in the shear strain rate distribution during saw-tooth chip formation while there is a stable peak position of the strain rate distribution during continuous chip formation. The PSZ thickness during saw-tooth chip formation is more localized and smaller than that during continuous chip formation (28 versus 35 μm).

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“…Generally, a smooth free surface is indicative of a brittle deformation mechanism resulting from crack initiation and propagation. Gu et al [42] suggested that this smooth texture occurs due to a rapidly moving sharp-tip crack within a transformed shear band. It is possible that the intense thermal generation due to the high cutting speed is sufficient to result in thermal softening and even a phase transformation within the shear band.…”

Section: Chip Morphologymentioning

confidence: 99%

Chip Morphology and Chip Formation Mechanisms During Machining of ECAE-Processed Titanium

Davis

Dabrow

Newell

et al. 2017

Journal of Manufacturing Science and Engineering

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Severe plastic deformation (SPD) processing such as equal channel angular extrusion (ECAE) has been pioneered to produce ultrafine grained (UFG) metals for improved mechanical and physical properties. However, understanding the machining of SPD-processed metals is still limited. This study aims to investigate the differences in chip morphology when machining ECAE-processed UFG and coarse-grained (CG) titanium (Ti) and understand the chip formation mechanism using metallographic analysis, digital imaging correlation (DIC), and nano-indentation. The chip morphology is classified as aperiodic saw-tooth, continuous, or periodic saw-tooth, and changes with the cutting speed. The chip formation mechanism of the ECAE-processed Ti transitions from cyclic shear localization within the low cutting speed regime (such as 0.1 m/s or higher) to uniform shear localization within the moderately high cutting speed regime (such as from 0.5 to 1.0 m/s) and to cyclic shear localization (1.0 m/s). The shear band spacing increases with the cutting speed and is always lower than that of the CG counterpart. If the shear strain rate distribution contains a shift in the chip flow direction, the chip morphology appears saw-tooth, and cyclic shear localization is the chip formation mechanism. If no such shift occurs, the chip formation is considered continuous, and uniform shear localization is the chip formation mechanism. Hardness measurements show that cyclic shear localization is the chip formation mechanism when localized hardness peaks occur, whereas uniform shear localization is operative when the hardness is relatively constant.

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Experimental study on the process of adiabatic shear fracture in isolated segment formation in high-speed machining of hardened steel

Cited by 13 publications

References 16 publications

Evaluation and prediction of material fatigue characteristics under impact loads: review and prospects

Evaluation and prediction of material fatigue characteristics under impact loads: review and prospects

Study of the Shear Strain and Shear Strain Rate Progression During Titanium Machining

Chip Morphology and Chip Formation Mechanisms During Machining of ECAE-Processed Titanium

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