Topic
Hydroforming
About: Hydroforming is a research topic. Over the lifetime, 2796 publications have been published within this topic receiving 26293 citations. The topic is also known as: Bulge forming.
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Patent•
07 Jun 2000
TL;DR: In this paper, the X-ray random intensity ratio in the orientation groups of 110} to 221} of the sheet face in the sheet thickness of 1/2 of the steel sheet is >=3.0.
Abstract: PROBLEM TO BE SOLVED: To produce a steel tube having excellent formability in hydroforming, or the like, and to provide its production method. SOLUTION: In this steel tube excellent in formability, the (r) value in the axial direction of the steel tube is >=17, the average of the X-ray random intensity ratios in the orientation groups of 110} to 221} of the sheet face in the sheet thickness of 1/2 of the steel sheet is >=3.0, the X-ray random intensity ratio in 110} of the sheet face in the sheet thickness of 1/2 of the steel sheet is >=6.0, and X-ray random intensity ratios in 001} and 112} of the sheet face in the sheet thickness of 1/2 of the steel sheet is all =10% in the temperature range of the Ar3 point or above and >=20% in the temperature range of Ar3 to (Ar3-60) deg.C, and the reduction working is completed at =600 deg.C to control the total reduction ratio in diameter to >=30%.
10 citations
TL;DR: In this article, a semi-analytical model is presented and experimental measures done on an original tube show the thickness scattering along a generating line of the tube, which justifies the processing of a linear sensitivity analysis which reveals the most influencing parameters on the accuracy of the hardening curve and gives information to perform relevant experiments.
Abstract: To get precise material data for advanced numerical modelling of tube hydroforming process, the tube bulging test is recommended. Stresses and strains in the tube cannot be evaluated easily and several approaches have been proposed. A review is proposed and points out their advantages and drawbacks. A semi-analytical model is presented and experimental measures done on an original tube show the thickness scattering along a generating line of the tube. These observations justify the processing of a linear sensitivity analysis which reveals the most influencing parameters on the accuracy of the hardening curve and gives information to perform relevant experiments.
10 citations
Patent•
13 Mar 2000
TL;DR: In this article, a high strength steel sheet excellent in formability after preworking has a composition containing retained austenite including carbon of >=1.0% by the average mass concentration and equi-axial ferrite having an aspect ratio of 0.5 to 3.0 in >=50% by volume ratio.
Abstract: PROBLEM TO BE SOLVED: To provide a high strength steel sheet used for automotive under-carriage members or the like particularly excellent in formability, e.g. in hydroforming accompanied with tube making and preworking before forming, and to provide its producing method. SOLUTION: This high strength steel sheet excellent in formability after preworking has a composition containing, by mass, 0.05 to 0.3% C, 0.3 to 2.5% Si, 0.5 to 3.0% Mn and 0.001 to 2.0% Al, and the balance iron with inevitable impurities and has a structure containing retained austenite including carbon of >=1.0% by the average mass concentration and equi-axial ferrite having an aspect ratio of 0.5 to 3.0 in >=50% by volume ratio.
10 citations
TL;DR: In this paper, the effect of superimposed hydrostatic pressure on necking, fracture initiation, and fracture surface formation was studied, and it was found that the superimposed hydstatic pressure has a great impact on the onset of fracture, but insignificant influence on the uniform strain.
10 citations
Patent•
22 Dec 1953
10 citations