Effect of notch root radius on tensile behaviour of 316L(N) stainless steel

Kumar, J. Ganesh; Nandagopal, M.; Laha, K.; Mathew, M.D.

doi:10.1179/1878641314y.0000000020

Cited by 18 publications

(2 citation statements)

References 12 publications

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“…The fracture displacement decreased, indicating that duc decreased with an increase in stress triaxiality. The average value of the tensile stre of the specimen was equated to the tensile strength under each working condition determined tensile strength is listed in Table 4, and it can be seen from Figure 16 th tensile strength increased with an increase in stress triaxiality [51][52][53]. The relatio between the average stress triaxiality and ultimate tensile strength is expressed as…”

Section: Influence Of Stress Triaxiality On Tensile Strengthmentioning

confidence: 99%

Phenomenological 2D and 3D Models of Ductile Fracture for Girth Weld of X80 Pipeline

Jia

Chen³

et al. 2023

Buildings

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Welding is the main method for oil/gas steel pipeline connection, and a large number of girth welds are a weak part of the pipeline. Under extremely complex loads, a steel pipeline undergoes significant plastic deformations and eventually leads to pipeline fracture. A damage mechanics model is a promising approach, capable of describing material fracture problems according to the stress states of the materials. In this study, an uncoupled fracture 2D model with a function of fracture strain and stress triaxiality, two uncoupled 3D fracture models, a consider the effect of Lode parameter stress-modified critical strain (LSMCS) model, and an extended Rice–Tracey (ERT) criterion were applied to X80 pipeline girth welds. Comprehensive experimental research was conducted on different notched specimens, covering a wide range of stress states, and the corresponding finite element models were established. A phenomenon-based hybrid numerical–experimental calibration method was also applied to determine the fracture parameter for these three models, and the stress triaxiality of the influence law of the tensile strength was analyzed. The results showed that the proposed fracture criterion could better characterize the ductile fracture behaviors of the girth welds of the X80 pipeline; however, the prediction accuracy of the 3D fracture model was higher than that of the 2D fracture model. The functional relationship between the tensile strength and stress triaxiality of the X80 pipeline girth welds satisfied the distribution form of the quadratic function and increased monotonically. The research results can be used to predict the fracture of X80 pipeline girth welds under various complex loads.

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Section: Influence Of Stress Triaxiality On Tensile Strengthmentioning

confidence: 99%

Phenomenological 2D and 3D Models of Ductile Fracture for Girth Weld of X80 Pipeline

Jia

Chen³

et al. 2023

Buildings

View full text Add to dashboard Cite

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“…The inverse dependence of strength on notch root radius of 316L (N) stainless steel was shown by using finite element simulations [65]. The strength decreases with increasing notch radius.…”

Section: Uni-axial Tensile Strengthmentioning

confidence: 99%

Notch tensile and dry sliding wear studies on Mg-Nd-Gd-Zn alloy

Soundararajan¹,

Liyakath²,

Srinidhi³

et al. 2022

Surf. Topogr.: Metrol. Prop.

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This main purpose of the present research is to investigate the properties of wear and tensile in smooth and notch conditions of the heat-treated Mg-Nd-Gd-Zn alloy. The material applications such as complex helicopter gear box casing, piston and brake actuating components demands tensile data in notch conditions and wear characterizations. The alloy was characterized for microstructure, hardness, tensile properties in smooth and notch conditions and tribological properties such as wear resistance and friction coefficient. The microstructure examination revealed equiaxed grain structure with the size of about 42μm. The XRD results confirms the presence of Mg3 (Nd) precipitates. Smooth and notched samples were evaluated to determine the effect of notch radii and ductile-brittle transition. Notched samples show 25.31% improvements in strength compared to the smooth sample with the marginal reduction in ductility (1.3-1.8%). The fractography results for notched specimens exhibited cleavage, intergranular mode whereas the smooth specimens exhibited quasi cleavage, inter and transgranular modes. At 10N, the wear rate and friction coefficient change from 8.83 x 10-5 mm3/min to 7.11 x 10-5 mm3/min (24.2%) and to 0.29 and 0.26 (11.5%) respectively when the sliding velocity increases from 1 to 5 m/s. Similarly, at 20N, the wear rate and friction coefficient change from 9.11 x 10-5 mm3/min to 0.75 x 10-6 mm3/min (12.7%) and 0.29 to 0.23 (26.1%) respectively when the sliding velocity increases from 1 to 5 m/s. With the increase of load, plastic deformation is dominant controlling the wear rate. With the increase of sliding speed, oxidation is dominant controlling the wear rate and friction coefficient. Mixed modes of wear mechanisms such as abrasion, oxidation, delamination, third body assisted wear and melt wear were observed.

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