Abstract
The in-plane biaxial specimen can well reflect the complex stress state of sheet metal. However, there is no standard for small-sized specimens used in the low-power biaxial fatigue testing machine. The main goal of this paper is to apply the finite element method and orthogonal experiment method to design the cruciform specimen, considering the influence of three main parameters including the diameter of the central semispherical thinning area, the minimum thickness of the center and the arm thickness of the specimen. According to the central strain dispersion coefficient and the strain concentration coefficient proposed in this paper, we ensured that the distribution of strain in the gauge area is uniform and the strain it at its maximum value at the same time. The optimized specimen is verified by a biaxial fatigue test with the digital image correlation (DIC) technique. It is found that the fatigue crack appears in the center region, which proves that the optimized specimen can be effectively used for biaxial fatigue test.
Highlights
In engineering applications, sheet metal is often in the complex stress state under biaxial or multiaxial cyclic loading, so it is not enough to study the mechanical properties of materials under uniaxial load
It is very important to study the in-plane biaxial fatigue life with the cruciform specimen, and the design of the cruciform specimen is the key to the success of this kind of test [2]
We provided a type of cruciform specimen for biaxial fatigue test
Summary
Sheet metal is often in the complex stress state under biaxial or multiaxial cyclic loading, so it is not enough to study the mechanical properties of materials under uniaxial load. In the traditional tensile test, it is implied that the constitutive equation under uniaxial stress state is the same as that under complex stress state. This assumption has been proved by many scholars to be inconsistent with the real stress condition. The stress state of a metal plate under plane condition is usually biaxial stress or multiaxial stress. It is very important to study the in-plane biaxial fatigue life with the cruciform specimen, and the design of the cruciform specimen is the key to the success of this kind of test [2]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
