Finite element analysis of load-carrying capacity of single lap joints bonded with epoxy/nanoalumina adhesives

2020 ◽  
Vol 2 (3) ◽  
pp. 035023
Author(s):  
Anurag Bharti ◽  
Sunil Kumar Gupta ◽  
Dharmendra Kumar Shukla
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Carrying Capacity ◽  
Lap Joints ◽  
Load Carrying Capacity ◽  
Element Analysis ◽  
Single Lap Joints ◽  
Load Carrying

Constraint-Based Fracture Mechanics Analysis of Cylinders With Circumferential Cracks

2009 ◽  
Author(s):  
Michael Bach ◽  
Xin Wang ◽  
Robert Bell
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Carrying Capacity ◽  
Load Carrying Capacity ◽  
Element Analysis ◽  
Fracture Parameters ◽  
Wide Range ◽  
Load Carrying ◽  
T Stress ◽  
Low Constraint

In this paper, the fracture behaviour of hollow cylinders with internal circumferential crack under tensile loading is examined extensively. Finite element analysis of the cracked cylinders is conducted to determine the fracture parameters including stress intensity factor, T-stress, and J-integral. Linear elastic finite element analysis is conducted to obtain K and T-stress, and elastic plastic analysis is conducted to obtain fully plastic J-integrals. A wide range of cylinder geometries are studied, with cylinder thickness ratios of ri/ro = 0.2 to 0.8 and crack depth ratio a/t = 0.2 to 0.8. These fracture parameters are then used to construct conventional and constraint-based failure assessment diagrams (FADs) to determine the maximum load carrying capacity of cracked cylinders. It is demonstrated that these tensile loaded cylinders with circumferential cracks are under low constraint conditions, and the load carrying capacity are higher when the low constraint effects are properly accounted for, using constraint-based FADs, comparing to the predictions from the conventional FADs.

Design Parameter Reliability Analysis of Induction Bends

2014 ◽  
Author(s):  
Venkata M. K. Akula ◽  
Lance T. Hill
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Reliability Analysis ◽  
Carrying Capacity ◽  
Design Variable ◽  
Bending Moment ◽  
Load Carrying Capacity ◽  
Element Analysis ◽  
Design Variables ◽  
Load Carrying

Induction pipe bends are essential multi-functional components in offshore applications performing not only as fluid conductors but also as structural members providing flexibility to the entire pipeline. The deforming mechanism of bends minimizes the effects of pipe walking, length changes due to thermal expansion/contraction, etc. However, the extent to which the bend deforms to counteract the pipeline deformation, prior to reaching plastic collapse, is dictated by the design variables. The pipe bend design variables include the geometry of the bend, the inelastic material properties, and the operating loads. The study of the influence of these variables is central to improving upon existing bend designs and is the focus of this research. The certification process for bends typically involves ensuring the pipe bending moment is within limits set by agencies such as DNV, ASME, etc. Closed form solutions for the bending moment do exist but they often do not consider the effects of large deformation and the material nonlinearity of the bends. Since it is impractical to perform physical tests for every possible design, numerical techniques such as the finite element methods are an attractive alternative. Furthermore, for a given bend design, the design variables are prone to deviation, due to manufacturing process, operating conditions, etc., which introduces variation in the structural response and the resulting bending moment. In this paper, a nonlinear finite element analysis of induction bends is discussed followed by a presentation of a simulation workflow and reliability analysis. The finite element analysis utilizes a nonlinear Abaqus model with an user-subroutine prescribing precise end loading and boundary conditions. The workflow utilizes the design exploration software, Isight, which automates the solution process. Thereafter, reliability analysis is performed by varying the design variables, such as bend angle, ovalization, etc. and the results of the simulation are presented. The objective is to illustrate a solution technique for predicting the induction bend load carrying capacity and to examine design robustness. An automated workflow is demonstrated which allows for quick design variable changes, there by potentially reducing design time. The reliability analysis allows analysts to measure the variation in the load carrying capacity resulting from the deviation of design variable specifications. These demonstrations are intended to emphasize that to ensure the success of a bend design, it is important to not only predict the load carrying capacity accurately but also to perform reliability analysis for the design.

Arrangement of interconnectors for starred angle compression members

1994 ◽  
Vol 21 (1) ◽  
pp. 76-80 ◽  
Author(s):  
Murray C. Temple ◽  
Sherief S. S. Sakla ◽  
David Stchyrba ◽  
Douglas Ellis
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Key Words ◽  
Carrying Capacity ◽  
Building Codes ◽  
Load Carrying Capacity ◽  
Element Analysis ◽  
Compression Members ◽  
Load Carrying

Starred angles are commonly used as web members in trusses. Standards contain requirements which specify the number of interconnectors to be used, but most standards do not specify a preferred arrangement for the interconnectors. When plates are used as interconnectors, three arrangements — aligned, alternating, or cruciform — are possible. Nine starred angles, three with each arrangement of interconnectors, were tested. A finite element analysis was also conducted. It was determined that the arrangement of the interconnectors did not affect the load-carrying capacity of the starred angles. Key words: angles, buckling, building (codes), columns (structural) interconnection, starred angle.

Failure analysis of simple overlap bonding joints and numerical investigation of the adhered tip geometry effect on the joint strength

2021 ◽  
Vol 63 (11) ◽  
pp. 1007-1011
Author(s):  
İsmail Saraç
Keyword(s):  
Finite Element Analysis ◽  
Experimental Study ◽  
Finite Element ◽  
Reference Model ◽  
Lap Joints ◽  
Shear Stresses ◽  
Element Analysis ◽  
Single Lap Joints ◽  
Failure Loads ◽  
Previous Experimental Study

Abstract This study was carried out in two stages. In the first step, a numerical study was performed to verify the previous experimental study. In accordance with the previous experimental study data, single lap joints models were created using the ANSYS finite element analysis program. Then, nonlinear stress and failure analyses were performed by applying the failure loads obtained in the experimental study. The maximum stress theory was used to find finite element failure loads of the single lap joints models. As a result of the finite element analysis, an approximate 80 % agreement was found between experimental and numerical results. In the second step of the study, in order to increase the bond strength, different overlap end geometry models were produced and peel and shear stresses in the adhesive layer were compared according to the reference model. As a result of the analyses, significant strength increases were calculated according to the reference model. The strength increase in model 3 and model 5 was found to be 80 % and 67 %, respectively, relative to the reference model.

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