In-Plane Mixed-Mode Fracture of the Thin Sheet Metal

2013 ◽  
Vol 444-445 ◽  
pp. 1301-1304
Author(s):  
Jing Lv ◽  
Bang Cheng Yang ◽  
Chun Ran ◽  
Yong Ping Shao
Keyword(s):  
Crack Initiation ◽  
Mixed Mode ◽  
Crack Extension ◽  
Thin Sheet ◽  
Crack Tip ◽  
Deformation Mode ◽  
Image Correlation ◽  
Mode I ◽  
Mixed Mode Fracture ◽  
Sheet Metals

The length of crack extension under stable crack extension is measured by digital image correlation technology and based on mixed-mode I/II fracture test. Quantitative analyses of the fracture properties are provided for thin sheet metals at stable crack extension under mode I, mode II and mixed-mode I/II loading conditions. The strain field of the crack tip at crack initiation is calculated by VIC-2D. It is suggested that the location of crack initiation is not at the crack tip. The fracture of recycled thin sheet metals is tough due to the large plastic deformation; mode I crack is the most difficult to extend; the load-carrying capacity is the minimum in 45° loading.

Experimental Study on Out-Plane Crack Extension in Rimmed Steel

2013 ◽  
Vol 690-693 ◽  
pp. 1767-1770
Author(s):  
Bang Cheng Yang ◽  
Jian Xiong Liu ◽  
Rong Xin Guo ◽  
Hai Ting Xia
Keyword(s):  
Mixed Mode ◽  
Crack Extension ◽  
Thin Sheet ◽  
Mode I ◽  
Pure Mode ◽  
Sheet Metals ◽  
Mode Iii ◽  
Steel Sheets ◽  
Fracture Tests ◽  
Plane Mode

Study on the fractural mechanism of thin sheet metals focuses on how to efficiently fracture and recycle the scrapped vehicles and electrical equipments. By using the experimental fracture mechanics, the failure mode was studied for 10F rimmed steel sheets to be crushed and recycled. In-plane mode I, out-plane mixed mode I /III and mode III fracture tests were conducted under different loading angles. The effects and contributions of mixed mode crack extensions for 10F rimmed steel sheets were analyzed and some sensitive fractural factors were studied. The experimental results show that pure mode III is most viable to fracture the thin sheet 10F rimmed steels.

scholarly journals Analysis of Inclined Cracks in Thin-Walled Circular Tube under Mixed-Mode I + II Fracture

Proceedings ◽  
2018 ◽  
Vol 2 (8) ◽  
pp. 517 ◽  
Author(s):  
Boy Raymond Mabuza
Keyword(s):  
Fracture Mechanics ◽  
Mixed Mode ◽  
Crack Tip ◽  
Theoretical Models ◽  
Mode I ◽  
Mixed Mode Fracture ◽  
Shear Stresses ◽  
Inclined Crack ◽  
Mode Fracture ◽  
Thin Walled

This paper provides a study on mixed-mode fracture mechanics in thin-walled tube which is subjected to tension, shear and torsion loading. This type of loading causes an inclined crack to develop and generate a mixture of normal and shear stresses ahead of a crack tip. The stress state ahead of a crack tip is frequently based on mixed-mode type of interactions which designate the amplitude of the crack tip stresses. The analytical expressions for the stress intensity factors for mixed-mode I + II approach are presented. The Paris law for mixed-modes I + II has been discussed. Mixed-mode fracture mechanics is used with theoretical models to predict the path of crack growth when an inclined crack is subjected to a combination of mode I and mode II deformations. The torque at which crack propagation can be expected has been determined. The numerical calculations have been carried out by using MATLAB code. The results are good and could be useful for companies working with thin-walled circular tubes.

Experimental and Numerical Analyses of Mixed Mode Crack Initiation Angle

2006 ◽  
Author(s):  
Jafar Al Bin Mousa ◽  
Nesar Merah ◽  
Abdel-Salam Eleiche ◽  
Abul-Fazal Arif
Keyword(s):  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Crack Initiation ◽  
Mixed Mode ◽  
Crack Tip ◽  
Numerical Analyses ◽  
Mixed Mode Fracture ◽  
Smith Method ◽  
Crack Initiation Angle

This paper presents a study for predicting crack initiation angle in the case of mixed mode fracture i.e., opening and sliding mode. Experimental and numerical analyses were carried out using photoelasticity and ANSYS finite element program, respectively. Polycarbonate specimens with a thickness of 3mm and different angles of inclinations namely 0° and 22.5° were considered in this analysis. Predicting the crack initiation angles is dependent on the value of stress in the vicinity of the crack tip. As a result, stress intensity factor is considered as the most significant parameter in this regard because it represents the stress level at the crack tip. In experimental analysis Schroedl and Smith method is used to calculate the pure opening mode stress intensity factor (KI) and Smith and Smith method for the mixed mode case (KI & KII). Then, SIF’s for straight and inclined crack are determined numerically using ANSYS. After that, the values of stress intensities are incorporated in minimum strain energy density criterion (S-Criterion) to find the crack’s angle of initiation.

Mixed-Mode I/II Crack Extension in Thin Sheet Metal

2013 ◽  
Vol 275-277 ◽  
pp. 156-159 ◽  
Author(s):  
Yong Ping Shao ◽  
Bang Cheng Yang ◽  
Chun Ran ◽  
Jing Lv
Keyword(s):  
Mixed Mode ◽  
Fracture Criterion ◽  
Thin Sheet ◽  
Image Correlation ◽  
Correlation Technique ◽  
Sheet Metals ◽  
Large Plastic Deformation ◽  
Digital Image Correlation Technique ◽  
Thin Sheet Metal ◽  
Quantitative Analyses

Real-time displacement in stable crack tearing was measured by digital image correlation technique. Quantitative analyses were provided on mixed-mode Ⅰ/Ⅱ fracture and critical CTOA for recycled thin sheet metals. It is shown that the fracture of recycled thin sheet metals is tough due to the large plastic deformation, and mixed-mode crack is easier to extend than mode Ⅰ crack. The critical CTOA at stable crack tearing is constant and can be used as a fracture criterion for the thin sheet metals.

scholarly journals Direct Evaluation of Mixed Mode I+II Cohesive Laws of Wood by Coupling MMB Test with DIC

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 374
Author(s):  
Jorge Oliveira ◽  
José Xavier ◽  
Fábio Pereira ◽  
José Morais ◽  
Marcelo de Moura
Keyword(s):  
Mixed Mode ◽  
Crack Tip ◽  
Linear Functions ◽  
Image Correlation ◽  
Bending Test ◽  
Mode I ◽  
Cohesive Law ◽  
Crack Tip Opening Displacement ◽  
Direct Evaluation ◽  
Cohesive Laws

Governing cohesive laws in mixed mode I+II loading of Pinus pinaster Ait. are directly identified by coupling the mixed mode bending test with full-field displacements measured at the crack tip by Digital Image Correlation (DIC). A sequence of mixed mode ratios is studied. The proposed data reduction relies on: (i) the compliance-based beam method for evaluating strain energy release rate; (ii) the local measurement of displacements to compute the crack tip opening displacement; and (iii) an uncoupled approach for the reconstruction of the cohesive laws and its mode I and mode II components. Quantitative parameters are extracted from the set of cohesive laws components in function of the global phase angle. Linear functions were adjusted to reflect the observed trends and the pure modes (I and II) fracture parameters were estimated by extrapolation. Results show that the obtained assessments agree with previous experimental measurements addressing pure modes (I and II) loadings on this wood species, which reveals the appropriateness of the proposed methodology to evaluate the cohesive law under mixed mode loading and its components.

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