Load Distributions in Bolted Single Lap Joints Under Non-Central Tensile Shear Loading

2020 ◽  
Author(s):  
Chaiwat Sinthusiri ◽  
Sayed A. Nassar
Keyword(s):  
Beam Theory ◽  
Shear Loading ◽  
Lap Joints ◽  
Tensile Shear ◽  
Single Lap Joints ◽  
Load Distributions ◽  
Bolt Preload ◽  
Proposed Model ◽  
Linear Spring ◽  
Pass Through

Abstract This study uses beam theory-based model to investigate a numerically calibrated bolt load distributions in a preloaded two-bolt single lap joint under non-central tensile shear loading. Linear spring-based modeling is used for the two preloaded bolts and substrates. In practice, due to geometric tolerance may not necessarily pass through the joint centerline causing an additional moment loading. Thus, the sharing load would not be equally distributed between all the bolt in the joint. The effect of various joint parameter, bolt preload and off-center location of the tensile shear loading is investigated and discussed. Proposed model would be useful in enhancing the reliability and safety of bolted joints.

scholarly journals Static and dynamic tensile shear test of glued lap wooden joint with four different types of adhesives

Holzforschung ◽  
2017 ◽  
Vol 71 (5) ◽  
pp. 391-396 ◽  
Author(s):  
Erik V. Bachtiar ◽  
Gaspard Clerc ◽  
Andreas J. Brunner ◽  
Michael Kaliske ◽  
Peter Niemz
Keyword(s):  
Urea Formaldehyde ◽  
Beech Wood ◽  
High Stress ◽  
Fatigue Loading ◽  
Shear Loading ◽  
Lap Joints ◽  
Tensile Shear ◽  
Static Test ◽  
Different Types ◽  
Stress Levels

Abstract Investigations of quasi-static and fatigue failure in glued wooden joints subjected to tensile shear loading are presented. Lap joints of beech wood (Fagus sylvatica L.) connected with four different types of adhesives, i.e. polyurethane (PUR), melamine urea formaldehyde (MUF), bone glue and fish glue, were experimentally tested until the specimens failed. The average shear strengths obtained from the quasi-static test ranged from 12.2 to 13.4 MPa. These results do not indicate any influence of the different adhesive types. The influence of the adhesives is only visible from the results of the fatigue tests, which were carried out under different stress excitation levels between 45% and 75% of the shear strength. Specimens bound with ductile adhesive (PUR) showed a slightly higher number of cycles to failure (Nf) at low-stress levels and lower Nf at high-stress levels in comparison to more brittle adhesives (MUF, fish glue). In general, the performances of animal glues and MUF were similar in both quasi-static and fatigue loading under dry conditions.

Principal Stress Model for Multi-Axial Fatigue of Preloaded Threaded Fasteners

2016 ◽  
Author(s):  
Amir Kazemi ◽  
Sayed A. Nassar ◽  
Zhijun Wu
Keyword(s):  
Principal Stress ◽  
High Cycle Fatigue ◽  
Fatigue Testing ◽  
Stress Amplitude ◽  
Shear Loading ◽  
Multiaxial Fatigue ◽  
Testing System ◽  
Tensile Shear ◽  
Threaded Fasteners ◽  
Proposed Model

A principal stress-based high cycle fatigue (HCF) model is proposed for cyclic multiaxial stresses in threaded fasteners under tensile-shear loading. The proposed model uses the fastener principle stress amplitude in order to construct mean-stress adjusted S-N curves for multi-axial stresses. Experimental validation is provided using an MTS fatigue testing system, with a special fixture that would allow combined cyclic tensile-shear loading of the fastener at various angles relative to the axis of the MTS grip axis. Experimentally validated multiaxial fatigue model is compared to classical uniaxial S-N curves. Detailed discussion of the model results is provided.

Tester for tensile shear evaluation of metal–polymer single lap joints

2018 ◽  
Vol 54 ◽  
pp. 321-326 ◽  
Author(s):  
Shotaro Kadoya ◽  
Fuminobu Kimura ◽  
Yusuke Kajihara
Keyword(s):  
Lap Joints ◽  
Tensile Shear ◽  
Single Lap Joints ◽  
Metal Polymer
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