Three-dimensional finite element models for the calculation of temperature and residual stress fields in laser cladding

Residual stress distribution in an oblique nozzle jointed to a vessel with J-groove welds was analyzed using a three-dimensional finite element method. All welding passes were considered in a 180-degree finite element (FE) model with symmetry. Temperature and stress were modeled for simultaneous bead laying. To determine residual stress distributions at the welds experimentally, a mock-up specimen was manufactured. The analytical results show good agreement with the experimental measurement data, indicating that FE modeling is valid.

Download Full-text

FINITE ELEMENT ANALYSIS OF THE THERMAL BEHAVIOUR OF SINGLE-DISC CLUTCHES DURING REPEATED ENGAGEMENTS

Tribologia ◽

10.5604/01.3001.0010.7559 ◽

2016 ◽

Vol 266 (2) ◽

pp. 9-24 ◽

Cited By ~ 4

Author(s):

Oday I. ABDULLAH ◽

Laith Abed SABRI ◽

Wassan S. Abd Al-SAHB

Keyword(s):

Finite Element ◽

Thermal Behaviour ◽

Thermal Stresses ◽

Three Dimensional ◽

Finite Element Models ◽

Element Analysis ◽

Premature Failure ◽

Friction Clutch ◽

Dimensional Finite Element ◽

Three Dimensional Finite Element

Most of the failures in the sliding systems occur due to the high thermal stresses, which generated at the interface between the contacting surfaces due to sliding between parts, such as friction clutches and brakes. In this paper, the thermal behaviour of a single-disc clutch is investigated. The surface temperatures of the friction clutch disc will be increased during repeated engagements, in some cases, will lead to premature failure of the clutch disc. In order to avoid this kind of failure, it the surface temperature should be calculated with high accuracy to know the maximum working temperature of the friction system. In this work, the temperature distributions are computed during four repeated engagements at regular intervals (5 s) for the same energy dissipation. Three-dimensional finite element models are used to simulate the typical friction clutch disc.

Download Full-text

A Three-Dimensional Finite Element Evaluation of a Destructive Experimental Method for Determining Through-Thickness Residual Stresses in Girth Welded Pipes

Journal of Engineering Materials and Technology ◽

10.1115/1.3225866 ◽

1986 ◽

Vol 108 (2) ◽

pp. 99-106 ◽

Cited By ~ 17

Author(s):

E. F. Rybicki ◽

J. R. Shadley

Keyword(s):

Residual Stress ◽

Finite Element ◽

Experimental Method ◽

Three Dimensional ◽

Element Model ◽

Stress Distributions ◽

Reference Stress ◽

Improvement Process ◽

Dimensional Finite Element ◽

Three Dimensional Finite Element

The accuracy of a destructive, experimental method for the evaluation of through-thickness residual stress distributions is investigated. The application of the method is to a welded pipe that has been subjected to a residual stress improvement process. The residual stress improvement process introduces gradients in the stress distribution. The question of interest is how well the back-computation method used to interpret the experimental data represents the residual stress distribution for this type of stress profile. To address this question, a finite element model was used to provide a reference stress solution for comparison with the back-computation results of the experimental method. Three-dimensional finite element stress analyses were also conducted to simulate the cutting steps of the destructive laboratory procedure. The residual stress distributions obtained by the back-computation procedure were then compared with the reference stress solutions provided by the finite element model. The comparisons show agreement and indicate that good results can be expected from the experimental method when it is applied to a pipe that has been subjected to a residual stress improvement process, provided that the axial gradient of stress is not too large.

Download Full-text