Experimental investigation of three-dimensional mixed-mode fracture of a titanium alloy at room and elevated temperatures

Zhang, Shao-Qin; Guo, Wei; Li, He; Deng, Ying

doi:10.1007/s11431-011-4498-6

Cited by 12 publications

(6 citation statements)

References 29 publications

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“…Fagerholt et al utilized the modified Arcan set‐up to study the quasi‐static fracture behaviour of thin‐wall cast aluminium components both experimentally and numerically . Zhang et al developed a new fracture experimental technique under quasi‐static condition based on high‐temperature moiré interferometry . They investigated I + II mixed‐mode fracture performance of titanium alloy TC11 compact tension‐shear specimen with various thicknesses at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…21 Zhang et al developed a new fracture experimental technique under quasi-static condition based on high-temperature moiré interferometry. 22 They investigated I + II mixed-mode fracture performance of titanium alloy TC11 compact tension-shear specimen with various thicknesses at elevated temperatures. Yang and Qian investigated the fracture resistance for aluminium alloy 5083-H112 over a complete range of I + II mixed-mode loadings using four-point bending and shear specimen.…”

Section: Introductionmentioning

confidence: 99%

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Experimental studies on mixed‐mode dynamic fracture behaviour of aluminium alloy plates with narrow U‐notch

Wen

Chen

et al. 2016

Fatigue Fract Eng Mat Struct

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Mixed‐mode dynamic fracture behaviour of cast aluminium alloy ZL205A thin plates with narrow U‐notch was studied by split Hopkinson tensile bar apparatus. Specimens with different loading angles were designed to realize different fracture modes. The same loading condition was maintained during the tests. Recovery specimens show that crack propagates along the notch direction. Force–elongation relations show that with the loading angle increasing, the fracture force increases while the final elongation decreases. Deformation and fracture process was observed by a high‐speed camera. Displacement distribution around the crack was calculated through digital image correlation technique. Based on the photos and displacement results, initiation time of the crack was derived. Besides, two stress components (normal stress and shear stress) applied on the fracture surface were investigated. Results show that crack initiation stresses at different loading angles satisfy the ellipse equation. Pure mode I and II fracture stresses are 425.3 and 236.7 MPa, respectively. Furthermore, specific fracture energy of different specimens was calculated. The energy data vary with loading angle and located on an approximate upward parabolic curve. From the curve, the minimum specific fracture energy of the thin plate specimen is 42.0 kJ/m2 under loading angle of 76.3°.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental studies on mixed‐mode dynamic fracture behaviour of aluminium alloy plates with narrow U‐notch

Wen

Chen

et al. 2016

Fatigue Fract Eng Mat Struct

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“…(3) We should integrate the physical model of the machining process with the dynamic model. To break through the limitations of conventional milling dynamic model for prediction of the geometric accuracy of machined surfaces, we should fuse the process dynamics with the multi-physics model [74][75][76][77], developing efficient numerical methods to explore the macro/micro performance of machined surfaces with respect to process parameters. (4) The last one is to fuse the dynamics model with some advanced machine tool control strategies [78][79][80][81][82][83][84][85][86][87][88] for high performance control ensuring high performance machining.…”

Section: Discussionmentioning

confidence: 99%

On time-domain methods for milling stability analysis

Ding

Zhu

2012

Chin. Sci. Bull.

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As a basic and advanced machining technique, the high-speed milling process plays an important role in realizing the goal of high performance manufacturing. From the viewpoint of machining dynamics, obtaining chatter-free machining parameters is a prerequisite to guaranteeing machining accuracy and improving machining efficiency. This paper gives an overview on recent progress in time domain semi-analytical methods for chatter stability analysis of milling processes. The state of art methods of milling stability prediction in milling processes and their applications are introduced in detail. The bottlenecks involved are analyzed, and potential solutions are discussed. Finally, a brief prospect on future works is presented. High speed milling is widely utilized in manufacturing of complex surfaces for the fields of aerospace, ship, automotive, dies and molds etc., due to its advantage of obtaining high machining accuracy and high material removal rate with keeping low-amplitude cutting forces. Regarding to modeling of machining processes, the research topics on high speed milling can be categorized as: tool path planning, machining dynamics and machining physical modeling. Tool path planning is to plan the tool path according to the workpiece model, machining strategy and required machined error [1][2][3][4][5]. From the viewpoint of machining dynamics, the relative vibration between the workpiece and cutter in the milling process is the main reason of reducing product surface quality and limiting the production efficiency. To suppress the vibration impact by optimizing the machining parameters, the following two questions need to be addressed.(1) Stability analysis based on the dynamics of milling processes. As far as chatter vibrations are concerned, there are four different mechanisms: regeneration [6], mode coupling [7], friction [8] and thermo-mechanics of chip formation [9]. In milling processes, regenerative chatter is the most common form of self-excited vibration to reduce surface quality and machining efficiency [10,11]. The works on analysis of the stability of milling processes focus on calculating the stability boundary of the machining parameters based on the dynamic models characterizing the milling processes.(2) Machining accuracy analysis on the basis of stability analysis. Due to forced vibrations in milling processes, chatter-free machining parameters cannot ensure high performance machining. Vibration-induced surface errors can be classified as surface location error (SLE) [12] and surface roughness [13]. It is essential to take the stability and dynamical errors into account in machining optimization models to achieve high performance milling.

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“…This behavior arose for polytetrafluoroethylene [6]. The effects of the thickness and high temperature on the mixed-mode fracture toughness and growth angles in titanium samples were studied by Zhang et al [7]. Guo et al [8] experimentally investigated the effects of the thickness on the mixed-mode I/II fracture behavior of LC4-CS aluminum alloys.…”

Section: Introductionmentioning

confidence: 99%

Mixed-mode fracture toughness versus thickness and yield strength in aluminum alloys

Seifi

Bahri

2019

J Braz. Soc. Mech. Sci. Eng.

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Variations in in-plane mixed-mode fracture toughness versus changes in thickness of shear CT (CTS) specimens and loading direction and effects of yield strength of different aluminum alloys have been investigated by experimental testing and numerical analysis. Several samples were made by Al2024-O, Al6061-T6 and Al7075-T6 alloys. Based on the results, increasing the thickness reduces the mixed-mode fracture toughness and near to the critical thickness, this reduction is lesser. Increase in mixed-mode loading angle for brittle materials has not significant effects on the toughness while in softer materials by changing the angle from 15° to 60°, the amount is halved. Near the mode I fracture conditions, there is no meaningful relationship between the yield strength and fracture toughness but with an increase in the second mode effects, these parameters will be proportional. The mixed-mode toughness of the alloys with different thicknesses can be calculated numerically with a precise accuracy by applying failure load in the analysis.

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Experimental investigation of three-dimensional mixed-mode fracture of a titanium alloy at room and elevated temperatures

Cited by 12 publications

References 29 publications

Experimental studies on mixed‐mode dynamic fracture behaviour of aluminium alloy plates with narrow U‐notch

Experimental studies on mixed‐mode dynamic fracture behaviour of aluminium alloy plates with narrow U‐notch

On time-domain methods for milling stability analysis

Mixed-mode fracture toughness versus thickness and yield strength in aluminum alloys

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