Development of an apparatus for biaxial testing using cruciform specimens

Makinde, A.; Thibodeau, L.; Neale, K. W.

doi:10.1007/bf02324725

Cited by 176 publications

(74 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Various cruciform specimens with different features were designed for biaxial testing [27,46,47] in order to characterise mechanical behaviour of metals subjected to biaxial loading, as shown in Fig. 3, but no standard of cruciform specimen geometry for biaxial testing has been developed and no existing specimens can be used directly in the new biaxial apparatus because of the usage of resistance heating.…”

Section: Dimensions Of Specimensmentioning

confidence: 99%

Formability evaluation for sheet metals under hot stamping conditions by a novel biaxial testing system and a new materials model

Shao

Lin

et al. 2017

International Journal of Mechanical Sciences

View full text Add to dashboard Cite

Published: Z. Shao, N. Li, J. Lin, T. Dean, 2017, Formability evaluation for sheet metals under hot stamping conditions by a novel biaxial testing system and a new materials model, Int. J. Mech. Sci., 120, pp149-158. AbstractHot stamping and cold die quenching has been developed in forming complex shaped structural components of metals. The aim of this study is the first attempt to develop unified viscoplastic damage constitutive equations to describe the thermo-mechanical response of the metal and to predict the formability of the metal for hot stamping applications. Effects of parameters in the damage evolution equation on the predicted forming limit curves were investigated. Test facilities and methods need to be established to obtain experimental formability data of metals in order to determine and verify constitutive equations. However, conventional experimental approaches used to determine forming limit diagrams (FLDs) of sheet metals under different linear strain paths are not applicable to hot stamping conditions due to the requirements of rapid heating and cooling processes prior to forming. A novel planar biaxial testing system was proposed before and was improved and used in this work for formability tests of aluminium alloy 6082 at various temperatures, strain rates and strain paths after heating, soaking and rapid cooling processes. The key dimensions and features of cruciform specimens adopted for the determination of forming limit under various strain paths were developed, optimised and verified based on the previous designs and the determined heating and cooling method [1]. The digital image correlation (DIC) system was adopted to record strain fields of a specimen throughout the deformation history. Material constants in constitutive equations were determined from the formability test results of AA6082 for the prediction of forming limit of alloys under hot stamping conditions. This research, for the first time, enabled forming limit data of an alloy to be generated at various temperatures, strain rates and strain paths and forming limits to be predicted under hot stamping conditions.

show abstract

Section: Dimensions Of Specimensmentioning

confidence: 99%

Formability evaluation for sheet metals under hot stamping conditions by a novel biaxial testing system and a new materials model

Shao

Lin

et al. 2017

International Journal of Mechanical Sciences

View full text Add to dashboard Cite

show abstract

“…Fessler [34] proposed a machine in which motion is allowed only in one direction at one arm for each cruciform axis. This is the most common basic configuration found in the literature related to biaxial characterization of composites [35], [33]. In an attempt to simplify the previous concept while maintaining symmetric load conditions, some modifications have been proposed; for example, each loading axis, consisting of a pair of opposite hydraulic actuators, can be connected to a common hydraulic line so the force exerted by each side is the same and thus movements of the centre of the specimen are eliminated.…”

Section: Hydraulic Systemsmentioning

confidence: 99%

Biaxial Tensile Strength Characterization of Textile Composite Materials

Escárpita¹,

Cárdenas²,

Elizalde³

et al. 2012

Composites and Their Properties

View full text Add to dashboard Cite

“…A successful development of failure or damage models for such applications require validation with experimental data which, at best, is generated from biaxial load conditions, as well [1]. One versatile experimental technique to generate such data is a biaxial tensile test with cruciform specimen [2]. Thereby, a cruciform specimen is exposed to potentially different loads in two orthogonal directions, and the resulting strain field is measured by digital image correlation (DIC).…”

Section: Introductionmentioning

confidence: 99%

Parametric shape optimization of biaxial tensile specimen

Bauer

Priesnitz

Schemmann

et al. 2016

Proc Appl Math and Mech

View full text Add to dashboard Cite

Common cruciform specimen for biaxial tensile testing of sheet moulding compound, take damage and finally fail in uniaxially loaded areas. When using these specimen, an observation of damage initialization and failure in biaxially loaded areas is, therefore, not possible. In this paper, a parametric shape optimization is described to find a more suitable specimen shape. The parametrization of the specimen is presented. Objective functions are introduced to measure the appropriateness of specimen. A weighted summation transfers the constraint multiobjective optimization problem into a constraint scalar-valued problem. Findings of experiments suggest that a specimen shape with straight, non-tapering arms and slits along the arms is reasonable.

show abstract

Development of an apparatus for biaxial testing using cruciform specimens

Cited by 176 publications

References 21 publications

Formability evaluation for sheet metals under hot stamping conditions by a novel biaxial testing system and a new materials model

Formability evaluation for sheet metals under hot stamping conditions by a novel biaxial testing system and a new materials model

Biaxial Tensile Strength Characterization of Textile Composite Materials

Parametric shape optimization of biaxial tensile specimen

Contact Info

Product

Resources

About