scholarly journals PREDICTION OF TENSILE AND FRACTURE PROPERTIES OF CRACKED CARBON STEEL WIRES USING FINITE ELEMENT SIMULATION

2014 ◽  
Vol 20 (2) ◽  
pp. 159-168 ◽  
Author(s):  
Kazeem K. Adewole ◽  
Steve J. Bull
Keyword(s):  
Finite Element ◽  
Carbon Steel ◽  
Fracture Mechanics ◽  
Finite Element Simulation ◽  
Shear Fracture ◽  
Steel Wire ◽  
Fracture Properties ◽  
Steel Wires ◽  
Element Simulation ◽  
The Wire

Steel wires are used as a bridge construction material and as pre-stressing strands or tendons in pre-stressed structural units among other applications in civil engineering. To date, the estimation of the load carrying capacity of a cracked wire has been based on purely experimental classical fracture mechanics work conducted with non-standardised classical fracture mechanics specimens as standard test specimens could not be manufactured from the wire owing to their size. In this work, experimental mechanical tests and finite element simulation with the phenomenological shear fracture model has been conducted to investigate the effect of miniature cracks with dimensions less than or equal to 0.2 mm (which is the limit of the current non-destructive detection technology) on the tensile and fracture properties of flat carbon steel wire. The investigation revealed that the reduction in the displacement at fracture of the wire due to the presence of cracks shallower than 0.2 mm is significantly higher than the reduction in the fracture load of the wire. Consequently, the displacement at fracture and by extension the fracture strain capacity of the wire could serve as a more appropriate parameter to assess the quality and the structural integrity of cracked wires.

Finite Element Simulation of Ceramics Machining

2016 ◽  
Vol 693 ◽  
pp. 775-779
Author(s):  
J.X. Xue ◽  
H.B. Wu ◽  
Q.P. Sun
Keyword(s):  
Finite Element ◽  
Fracture Mechanics ◽  
Brittle Fracture ◽  
Fracture Energy ◽  
Finite Element Simulation ◽  
Material Removal ◽  
Machining Process ◽  
Removal Mechanism ◽  
Material Removal Mechanism ◽  
Element Simulation

The evolution of crack models based on fracture mechanics is reviewed. The brittle cracking model in Abaqucs is used to simulate the machining process of Al2O3. The result shows that it’s appropriate to simulate the machining process of ceramics with fracture energy cracking criterion and post-failure constitutive relation in a smeared cracking representation. Although more works are needed in the future to resolve the mesh sensitivity. The material removal mechanism of ceramics is confirmed to be the brittle fracture regime.

Prediction of Hardness in Drawn Copper Wire by Effective Strain from Finite Element Simulation

2019 ◽  
Vol 947 ◽  
pp. 103-108
Author(s):  
Chao Cheng Chang ◽  
Yen Ta Hsieh ◽  
Chun Hsuan Kao ◽  
Shun Yu Shao ◽  
Chia Hao Hsu
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Copper Wire ◽  
Wire Drawing ◽  
Reference Curve ◽  
Element Simulation ◽  
The Wire ◽  
The Difference ◽  
Drawing Dies ◽  
Hardness Values

The study developed a hardness-strain reference curve to be used with the finite element simulation for the prediction of the hardness in the drawn copper wire. The hardness values of the deformed copper specimens from tensile tests were analyzed to construct a relationship between hardness and strain. By using an industrial wire drawing machine, a copper wire was drawn by 5 passes to reduce its diameter from 8 to 4.64 mm. All drawing dies used the same configurations which include an area reduction ratio of 20 percent, an approach angle of 7°, and a bearing length of 0.5 times the feeding wire diameter. The finite element simulations of the wire drawing processes were also performed to predict the effective strains in the drawn copper wires. With the use of the developed hardness-strain curve, the hardness of the drawn wires can be estimated. The results show that the difference between the predicted and measured hardness values is about 10 percent lower in the early stage of the wire drawing process, and the difference increases with the number of passes to about 30 percent higher in the later stage of the process.

The Influence of the Cutting Speed and Feed Rate on the Machinability Ratings in Machining of AISI 1045 Carbon Steel and AlSI1MgMn Aluminium Alloy

2013 ◽  
Vol 436 ◽  
pp. 194-204 ◽  
Author(s):  
Nicoleta Lungu ◽  
Sorin Mihai Croitoru ◽  
Claudiu Florinel Bîșu ◽  
Constantin Dumitraşcu ◽  
Marian Borzan
Keyword(s):  
Finite Element ◽  
Carbon Steel ◽  
Aluminium Alloy ◽  
Finite Element Simulation ◽  
Cutting Forces ◽  
Cutting Speed ◽  
Experimental Tests ◽  
Geometrical Parameters ◽  
Element Simulation ◽  
Aisi 1045

The research presented in this paper refers to the study of the influence of feed and cutting speed on the cutting forces, temperatures and chips formation in turning of AISI 1045 carbon steel and AlSi1MgMN aluminium alloy. This work presents both finite element simulation and experimental tests. Parameters have been considered variable in the process are cutting speed and feed, and depth of cut and tool geometrical parameters were kept constant. The purpose of the experimental procedure it was the acquisition data for cutting forces and temperatures by on-line monitoring, with KISTLER dynamometer for cutting forces and Flyr System ThermaCAM SC640 termography camera for temperatures. Both results obtained by finite element simulation and experimental tests show that the feed increasing lead to increased cutting forces and temperatures. Also, are presented the type of the chip obtained in orthogonal cutting of the two materials.

Finite Element Simulation on Failure Assessment of Toughened Epoxy Adhesives

2011 ◽  
Vol 488-489 ◽  
pp. 537-540
Author(s):  
P. Akbarzadeh ◽  
Khalil Farhangdoost
Keyword(s):  
Finite Element ◽  
Fracture Mechanics ◽  
Finite Element Simulation ◽  
Strain Energy Release ◽  
Failure Criteria ◽  
Adhesively Bonded Joints ◽  
Epoxy Adhesives ◽  
Toughened Epoxy ◽  
Element Simulation ◽  
Explicit Consideration

The prediction of the strength of adhesively bonded joints has been investigated using a variety of failure criteria such as maximum stress or strain, and fracture mechanics approaches. Fracture mechanics approaches based on the critical strain energy release rate, for crack propagation are applicable to highly cross-linked structural adhesives and have the advantage of avoiding the explicit consideration of the bi-material singularities inherent in adhesive joints. In the present work, the finite-element simulation of such adhesive joint has been performed and the R-curves of two different rubber-toughened epoxy adhesives were measured using double cantilever beam (DCB) specimens. The FE results are applied to be compared with the experimental results which were reported in the literature.

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