The effect of mechanical behavior on bendability of ultrahigh-strength steel

Arola, Anna-Maija; Kaijalainen, Antti; Kesti, Vili; Troive, Lars; Larkiola, Jari; Porter, David

doi:10.1016/j.mtcomm.2020.101943

Cited by 17 publications

(8 citation statements)

References 26 publications

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“…Hence, the bending test was also conducted on the steel in cryogenic treated condition and its bending angle was measured to evaluate the steel’s crashworthiness. It is to be noted that the bending test was conducted with the worst specimen configuration such that the bending axis is in the longitudinal direction, which normally gives worse properties than the one in the transverse direction 50 , 51 . Only the IA725 and IA735 specimens were subjected to the bending test since the IA715-LN 2 specimen has much lower strength than the HPF steels.…”

Section: Resultsmentioning

confidence: 99%

Overcoming the strength–formability trade-off in high strength steels via cryogenic treatment

Park

Zargaran

et al. 2022

Sci Rep

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High strength steels are becoming more important than ever before for automotive applications to reduce the weight of automobiles and to ensure the safety of passengers. Since increased strength usually results in degraded formability, however, cold forming of high strength steels into final shapes remains a challenge to both automotive manufacturers and suppliers. Here we report novel alloy and processing design concepts that can impart high strength to cold-formable steels, which deviates from the traditional approach of improving the formability of high strength steels. Such designed steel subjected to a designed processing route shows an excellent combination of formability and strength as well as crashworthiness, which is crucial for the safety of passengers in the automobiles. The alloy and processing design concepts used in the present study are based on the utilization of thermally induced austenite to martensite transformation, which imparts high strength to cold-formable austenite by cryogenic treatment.

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Section: Resultsmentioning

confidence: 99%

Overcoming the strength–formability trade-off in high strength steels via cryogenic treatment

Park

Zargaran

et al. 2022

Sci Rep

View full text Add to dashboard Cite

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“…The bending test determined the deformation capacity of a material in bending. 44 The test was implemented according to the EN ISO 7438 standard. Three-point bending testing of the beam was implemented by using the ALSA brand compression device at 1 mm/min compression speed.…”

Section: Methodsmentioning

confidence: 99%

Experimental, analytical, and numerical investigations on the flexural and fatigue behavior of steel thin-walled X-section beam

İrsel

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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Thin-walled hollow shapes are of great interest in many industries with weight constraints, due to their availability, low price, and strength-to-weight ratio. This paper presents the development, calculation, and production of a thin-walled X-section beam design with a unique section geometry. This hollow X-section beam geometry is a beam that has been developed to use shape-connected jaws on the beam and to use less bolts and mounting elements, and to easily change the positions of the parts mounted on the beam. The bending strength of this unique beam section was investigated, and the fatigue damage of the beam was also handled with technological methods. Using both experimental stress measurements and finite element solution, the static and fatigue strength of the beam were calculated with computer-aided engineering software. The FEM solution was performed nonlinearly by defining the linear elastic and plasticity properties of the material. Validation studies were carried out in the laboratory using three-point and four-point bending tests. These traditional experiments were supported by strain gauge technology that measures strain with 0.05% accuracy. The weight and bending strength of the X-section beam were compared with the hollow section square beam. X-section beam (S355J0H) has 13% lower bending strength than 120 × 120 × 8 mm (S355J0H) beam; however, it is 37% lighter. ANSYS-analytical test results of difference are 3.95%, and ANSYS-experimental test results of difference are 0.85%. Experiments showed that a ∼22% increase in strength is found in these corners depending on the production method. The fatigue behavior of the X-section beam was determined with the nCode DesignLife software using validated FEM solutions and fatigue curves of the materials. X-section beam developed for shape–connected assembly systems can be used especially in the formation of chassis with its superior assembly ability and bending strength, increasing functionality, and production speed.

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“…The bending test standard TS 205-1 EN ISO 7438 specifies a method for determining the deformation capability of a material in bending. 33 The three-point bending test of the beam was performed at a speed of 5 mm/min. In the three-point bending test, applied force, displacement, bending angle of the beam, and an instantaneous stress value from the strain gage rosettes attached to the beams were measured.…”

Section: Materials Selection and Testingmentioning

confidence: 99%

Strength-based design of a sunflower stalk cutter machine design using finite element analysis and experimental validation

İrsel

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this study, the total algorithm of the strength-based design of the system for mass production has been developed. The proposed algorithm, which includes numerical, analytical, and experimental studies, was implemented through a case study on the strength-based structural design and fatigue analysis of a tractor-mounted sunflower stalk cutting machine (SSCM). The proposed algorithm consists of a systematic engineering approach, material selection and testing, design of the mass criteria suitability, structural stress analysis, computer-aided engineering (CAE), prototype production, experimental validation studies, fatigue calculation based on an FE model and experimental studies (CAE-based fatigue analysis), and an optimization process aimed at minimum weight. Approximately 85% of the system was designed using standard commercially available cross-section beams and elements using the proposed algorithm. The prototype was produced, and an HBM data acquisition system was used to collect the strain gage output. The prototype produced was successful in terms of functionality. Two- and three-dimensional mixed models were used in the structural analysis solution. The structural stress analysis and experimental results with a strain gage were 94.48% compatible in this study. It was determined using nCode DesignLife software that fatigue damage did not occur in the system using the finite element analysis (FEA) and experimental data. The SSCM design adopted a multi-objective genetic algorithm (MOGA) methodology for optimization with ANSYS. With the optimization solved from 422 iterations, a maximum stress value of 57.65 MPa was determined, and a 97.72 kg material was saved compared to the prototype. This study provides a useful methodology for experimental and advanced CAE techniques, especially for further study on complex stress, strain, and fatigue analysis of new systematic designs desired to have an optimum weight to strength ratio.

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The effect of mechanical behavior on bendability of ultrahigh-strength steel

Cited by 17 publications

References 26 publications

Overcoming the strength–formability trade-off in high strength steels via cryogenic treatment

Overcoming the strength–formability trade-off in high strength steels via cryogenic treatment

Experimental, analytical, and numerical investigations on the flexural and fatigue behavior of steel thin-walled X-section beam

Strength-based design of a sunflower stalk cutter machine design using finite element analysis and experimental validation

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