SIMULATION OF SURFACE DEFORMATION USING INCONEL 718 DIC-ANALYSIS OF HEATING ALLOY

Author(s):  
Sergey Adjamskiy ◽  
Ganna Kononenko ◽  
Rostislav Podolskyi

. Fracture is the final stage of metal behavior under load, and the resistance that themetal gives to the development of this process, largely determines its structural strength. Inconel718 is gaining strength mainly due to the dispersion hardening in the allocation of secondaryphases. Purpose: to establish a set of mechanical properties and microstructure of heatstrengthened Inconel 718 and to investigate changes in the degree of deformation of the surfacemetal by the method of registration of macroloca l fields. Mechanical properties were determinedby standard methods on three samples. Registration of macrolocal displacement fields wasrecorded by DIC (digital image correlation) method simultaneously with stretching. The dataobtained from the DIC analy sis showed that at the time of rupture the local deformation of thesample increased to 36% sample 1, up to 50% sample 2, up to 25% sample 3. It is shown thatthe microstructure of the studied samples is homogeneous, the detected grain γ structure with theformation of duplicates, the density of the experimental samples was 98.3%.

2015 ◽  
Vol 12 (1) ◽  
pp. 69-76 ◽  
Author(s):  
Alireza Karimi ◽  
Reza Razaghi ◽  
Mahdi Navidbakhsh ◽  
Toshihiro Sera ◽  
Susumu Kudo

2007 ◽  
Vol 129 (6) ◽  
pp. 913-918 ◽  
Author(s):  
Tao Cheng ◽  
Rong Z. Gan

Measurement on mechanical properties of the stapedial tendon in human middle ear has not been reported in the literature. In this paper, we used the material testing system to conduct uniaxial tensile, stress relaxation, and failure tests on stapedial tendon specimens harvested from human temporal bones. The digital image correlation method was employed to assess the boundary effect on experimental data. The stress-strain relationship of the tendon obtained from experiments was analyzed using the hyperelastic Ogden model. The results presented include (1) the constitutive equation of the tendon for stretch ratio of 1–1.4 or stress range of 0–1.45MPa, (2) the mean ultimate stress and stretch ratio of the tendon at 4.04MPa and 1.65, respectively, and (3) the hysteresis and normalized stress relaxation function of the tendon. The data reported in this paper contribute to ear mechanics, especially for theoretical analysis of human ear function.


2017 ◽  
Vol 741 ◽  
pp. 138-143 ◽  
Author(s):  
Norimitsu Koga ◽  
Osamu Umezawa

Digital image correlation (DIC) method is a convenient strain analysis method calculating strain from the difference of images between before and after deformation and shows an advantage to apply to any deformation mode or materials as long as significant contrast. We reviewed basic principles of DIC method and then demonstrated strain distribution in tensile deformed ferritic steel and cyclic deformed tempered martensitic steel. Strain distribution in tensile deformed ferritic steel becomes inhomogeneous with lowering temperature due to restriction of slip systems at low temperature. Strain distribution around a fatigue crack in cyclic deformed tempered martensitic steel was visualized by DIC analysis for replica film and strain concentrated on crack tip same as previous report in DIC analysis for specimen surface, which suggests that strain distribution obtained from replica film has an enough reliability. From these results, it can be concluded that DIC analysis is effective method to investigate local deformation and relation between local deformation and fracture behavior in metal materials.


2015 ◽  
Vol 665 ◽  
pp. 209-212
Author(s):  
Dong Chang Li ◽  
Huang Chao ◽  
Qu Jia

Rubber material is non-linear, hyper-elastic and incompressible. Its complex mechanical properties increase the difficulties of the theoretical calculation in large deformation. As the development of computing capacity and optical sensors, DIC (Digital Image Correlation) method has become an important method in measuring large deformation of rubber material. In this paper, DIC method was used to measure different depth of burial defective rubber in tensile test, the result, however, failed to test the burial defects of rubber sheet. In order to explore the failure mechanism, the finite element simulation test is completed using Mooney-Rivlin material model of two parameters. The undetected phenomenon is caused by rubber’s hyper elasticity and low-rigidity. The results show that DIC method can be effectively applied to the measurement and evaluation of mechanical properties of rubber-like material’s surface defects, but not its burial defects. The fact that DIC method is unable to detect the burial defects of rubber sheet should be paid more attention.


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