Numerical and experimental investigation of the effect of cold extrusion process on residual stress and fatigue life of internal thread of high-strength steel

Wan, Nian; He, Qiang; Jing, Xuwen; Jiang, Yonggang; Zhou, Honggen

doi:10.1007/s00170-023-11765-8

Cited by 5 publications

(3 citation statements)

References 27 publications

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“…Consequently, the outcomes of this study bear practical significance for industrial applications and align with Sustainable Development Goals 7, 9, 10, and 12 [38]. Previous research has delved into evaluating the fatigue life of welded components through fatigue experiments [39] and conducting numerical investigations [40] to explore the optimal process parameters for RFW. Developing numerical models to simulate the RFW process [41][42][43] can aid in predicting and optimizing welding outcomes and understanding the thermal and mechanical aspects of the process.…”

Section: Discussionmentioning

confidence: 71%

Enhancing the Weld Quality of Polylactic Acid Biomedical Materials Using Rotary Friction Welding

Kuo,

Liang,

Huang

et al. 2024

Polymers

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Polylactic acid (PLA) stands out as a biomaterial with immense potential, primarily owing to its innate biodegradability. Conventional methods for manufacturing PLA encompass injection molding or additive manufacturing (AM). Yet, the fabrication of sizable medical devices often necessitates fragmenting them into multiple components for printing, subsequently requiring reassembly to accommodate the constraints posed by the dimensions of the AM platform. Typically, laboratories resort to employing nuts and bolts for the assembly of printed components into expansive medical devices. Nonetheless, this conventional approach of jointing is susceptible to the inherent risk of bolts and nuts loosening or dislodging amid the reciprocating movements inherent to sizable medical apparatus. Hence, investigation into the joining techniques for integrating printed components into expansive medical devices has emerged as a critical focal point within the realm of research. The main objective is to enhance the joint strength of PLA polymer rods using rotary friction welding (RFW). The mean bending strength of welded components, fabricated under seven distinct rotational speeds, surpasses that of the underlying PLA substrate material. The average bending strength improvement rate of welding parts fabricated by RFW with three-stage transformation to 4000 rpm is about 41.94% compared with the average bending strength of PLA base material. The average surface hardness of the weld interface is about 1.25 to 3.80% higher than the average surface hardness of the PLA base material. The average surface hardness of the weld interface performed by RFW with variable rotational speed is higher than the average surface hardness of the weld interface performed at a fixed rotating friction speed. The temperature rise rate and maximum temperature recorded during RFW in the X-axis of the CNC turning machine at the outer edge of the welding part surpassed those observed in the internal temperature of the welding part. Remarkably, the proposed method in this study complies with the Sustainable Development Goals due to its high energy efficiency and low environmental pollution.

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Section: Discussionmentioning

confidence: 71%

Enhancing the Weld Quality of Polylactic Acid Biomedical Materials Using Rotary Friction Welding

Kuo,

Liang,

Huang

et al. 2024

Polymers

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“…The numerical model of the process took into account the heat flow between objects and the increase in the temperature of the workpiece due to plastic deformation. The contact conditions between the rigid objects and the rigid-plastic object were described using a heat transfer coefficient of 10 kW/m 2 K and friction factor of 0.1 [3,28,29].…”

Section: Methodsmentioning

confidence: 99%

Analysis of a New Process for Forming Two Flanges Simultaneously in a Hollow Part by Extrusion with Two Moving Dies

Winiarski,

Gontarz,

Skrzat

et al. 2024

Metals

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This paper presents a new method for forming flanges in hollow parts. The process consists of an extrusion with two dies that move in an opposite direction to that of the punches. This particular kinematics of the tools makes it possible to form two flanges simultaneously in a single tool pass. The proposed method was investigated using a tube made of steel 42CrMo4. It was assumed that the extrusion would be conducted as a cold forming process at ambient temperature. Different diameters and heights of the impression made in the top and bottom dies were used. It was demonstrated that the main failure mode of the proposed technique was an unintended increase in the inside the diameter of the workpiece in the flange zone. The results showed that the above parameters had a key impact on the achievable maximum flange diameters and heights.

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“…It can reduce the hole edge stress under external load and effectively inhibit the crack generation at the hole edge [11][12][13]. Compression bushings have been massively applied to the fatigue strengthening of the important joints of many aircraft models at home and abroad [14,15]. The domestic academic system has invested a great deal of research in order to clarify the cold expansion strengthening mechanism.…”

Section: Introductionmentioning

confidence: 99%

Research on the Residual Stress Field of a Compression Bushing-Lug Plate in Cold Expansion Strengthening

Lin,

Bai,

Wang

et al. 2023

Applied Sciences

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The accurate acquisition of the residual stress field is the key to clarifying the cold expansion strengthening mechanism of compression bushings, optimizing the extrusion process parameters, and improving the structural fatigue life. In the actual cold expansion strengthening process, the resultant distribution of residual stresses is influenced by the relative extrusion amount, mandrel structure, material properties, and extrusion speed. In this article, the distribution patterns of residual stress after cold extrusion are investigated through a combination of finite element simulation and experimental measurements using a micro-region stress tester. To examine the redistribution law of the stress field of cold expansion reinforcement under external load, the compression bushing-lug-plate-reinforced structure is loaded and unloaded. The results show that large circumferential residual compressive stresses are distributed in the hole wall of the compression bushing after cold expansion. Radial residual stresses are also compressive stresses, although the values are small. In addition, the reinforced structure after cold extrusion presents a large difference in the stress redistribution rules compared with cold extrusion after the load is applied and removed.

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Numerical and experimental investigation of the effect of cold extrusion process on residual stress and fatigue life of internal thread of high-strength steel

Cited by 5 publications

References 27 publications

Enhancing the Weld Quality of Polylactic Acid Biomedical Materials Using Rotary Friction Welding

Enhancing the Weld Quality of Polylactic Acid Biomedical Materials Using Rotary Friction Welding

Analysis of a New Process for Forming Two Flanges Simultaneously in a Hollow Part by Extrusion with Two Moving Dies

Research on the Residual Stress Field of a Compression Bushing-Lug Plate in Cold Expansion Strengthening

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