Effect of Cure Temperature and Pressure on Autoclave-Bonded Polycarbonate Single Lap Joints

2016 ◽  
Author(s):  
Sayed A. Nassar ◽  
Shraddha Jagatap ◽  
Marcello Tardito
Keyword(s):  
Load Transfer ◽  
Mechanical Performance ◽  
Lap Joints ◽  
Mode Analysis ◽  
Single Lap Joints ◽  
Failure Data ◽  
Failure Mode Analysis ◽  
Temperature And Pressure ◽  
Cure Temperature ◽  
Joint Load

This study investigates the effect of cure temperature and pressure on the mechanical performance of autoclave-bonded single lap joints (SLJ). Joint load transfer capacity (LTC) and failure mode analysis are provided. Test joints are made of two polycarbonate lexan adherends that are autoclave-bonded together using aliphatic polyether (Polyurethane) film adhesive (Huntsman PE399). Two levels of cure pressure and cure temperature are investigated, for their effect on joint load transfer capacity and failure. Data analysis and discussion are provided.

Effect of Adhesive Nano-Additives on Static Load Transfer Capacity and Failure Mode of Bonded Steel-Magnesium Single Lap Joints

2015 ◽  
Author(s):  
Sayed A. Nassar ◽  
Kassem Moustafa ◽  
Zhijun Wu ◽  
Demetrios Tzelepis
Keyword(s):  
Failure Mode ◽  
Load Transfer ◽  
Lap Joints ◽  
Mode Analysis ◽  
Paper Test ◽  
Single Lap Joints ◽  
Nano Powder ◽  
Failure Mode Analysis ◽  
Particulate Size ◽  
20 Nm

An experimental procedure and test setup is used for investigating effect of using nanoparticle additives to the adhesive on the load transfer capacity (LTC) of bonded magnesium (Mg)-steel (St) single lap joints (SLJ). Investigated variables include the nano-powder material (Alumina vs. Silica), particulate size (20 nm vs. 80 nm), and concentration in the adhesive (2.5% wt. vs 5.0 % wt.). Two different levels of surface roughness on the bonded area are used; namely, sanding the bond area with G60 or G180 sand paper. Test data and SEM failure mode analysis are provided.

Effect of Adhesive Nanoparticle Enrichment on Static Load Transfer Capacity and Failure Mode of Bonded Steel–Magnesium Single Lap Joints

2015 ◽  
Vol 137 (5) ◽  
Author(s):  
Sayed A. Nassar ◽  
Zhijun Wu ◽  
Kassem Moustafa ◽  
Demetrios Tzelepis
Keyword(s):  
Failure Mode ◽  
Load Transfer ◽  
Lap Joints ◽  
Mode Analysis ◽  
Paper Test ◽  
Experimental Procedure ◽  
Single Lap Joints ◽  
Failure Mode Analysis ◽  
Particulate Size ◽  
20 Nm

An experimental procedure and test setup are used for investigating effect of using nanoparticle additives to the adhesive on the load transfer capacity (LTC) of bonded magnesium (Mg)–steel (St) single lap joints (SLJ). Investigated variables include the nanopowder material (alumina versus silica), particulate size (20 nm versus 80 nm), and concentration in the adhesive (2.5 wt.% versus 5.0 wt.%). Two different levels of surface roughness on the bonded area are used, namely, sanding the bond area with G60 or G180 sand paper. Test data and scanning electron microscopy (SEM) failure mode analysis are provided.

Effect of Autoclave Cure Time and Surface Preparation on Film Adhesive Bond in Lightweight Material Joints

2018 ◽  
Author(s):  
Isotta Morfini ◽  
Luca Goglio ◽  
Giovanni Belingardi ◽  
Sayed A. Nassar
Keyword(s):  
Failure Mode ◽  
Load Transfer ◽  
Mechanical Performance ◽  
Surface Preparation ◽  
Adhesive Bond ◽  
Lap Joints ◽  
Mode Analysis ◽  
Bonding Parameters ◽  
Film Adhesive ◽  
Cure Time

This study investigates the effect of cure time and surface roughness on mechanical performance of single lap joints (SLJ). Test joints are made of aluminum/aluminum or aluminum/magnesium adherends that are autoclave-bonded using a commercially available film adhesive. Joint mechanical performance is assessed in terms of the static load transfer capacity (LTC), fatigue life and failure mode. Except for the cure time, all the rates of the other autoclave-bonding parameters are kept constant; namely, the level of cure temperature and pressure, as well as the rates of autoclave heating, cooling, pressurization and depressurization. Test data, failure mode analysis, discussion, observations and conclusions are provided.

Effect of Heat Cycling and Joining Method on the Mechanical Performance of Multi-Material Single Lap Joints

2015 ◽  
Author(s):  
Kaori Sakai ◽  
Sayed A. Nassar
Keyword(s):  
Load Transfer ◽  
Static Load ◽  
Mechanical Performance ◽  
Dynamic Performance ◽  
Lap Joints ◽  
Bolted Joints ◽  
Fiber Reinforced Polymer ◽  
Single Lap Joints ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced

In this experimental study, both environmental effects and various joining methods are investigated for their impact on the static and dynamic performance of multi-material lightweight single lap joints (SLJ). Adherends are conveniently divided into either composite-based or steel-based lightweight materials that include glass fiber reinforced polymer (GFRP), steel (St), aluminum (Al), or magnesium (Mg). A commercially available adhesive is selected for bonded-only and hybrid bonded-and-bolted joints. Changes in joint static load transfer capacity (LTC) and durability life are investigated for bonded-only, bolted-only, and hybrid bonded-and-bolted joints. Cyclic temperature profile fluctuates between 20° C and 80° C at a constant relative humidity (RH) level of either 20 % or 85 %. Effect on durability life is also studied under a cyclic load that fluctuates between 67.5 % and 75 % of the static load transfer capacity at ambient condition. Detailed discussion of the results, observations, and conclusions are presented in this paper.

Experimental investigation on adhesive bonding of similar and dissimilar weld joint used for automotive applications

2021 ◽  
pp. 095440892110631
Author(s):  
Rohit Verma ◽  
Lochan Sharma ◽  
Mayank Chauhan ◽  
Rahul Chhibber ◽  
Kanwer Singh Arora
Keyword(s):  
Tensile Strength ◽  
Failure Mode ◽  
Adhesive Bonding ◽  
Lap Joints ◽  
Mode Analysis ◽  
Dissimilar Joints ◽  
Bonding Parameters ◽  
Adhesion Failure ◽  
Failure Mode Analysis ◽  
Length Changes

The automobile industry has started using adhesive bonding to join load bearing components which aerospace industry has been using for decades. Adhesive lap joints are used frequently in the manufacture of automobile. In present study, structural adhesives were used to join the aluminium alloy (AA5083 H111) with the HSS dual phase (DP780) steel. Adhesive bonding appears to be one of the appropriate methods of joining dissimilar materials. The aim of this work is to analyze the tensile strength of similar and dissimilar joints. The influence of various parameters was also investigated such as the overlap length and the bondline thickness of specimens. In DP steel, there is 22% increase in strength for similar lap joint when overlap length changes from 10 mm to 15 mm, while there is 45% increase in strength when it varies from 15 mm to 20 mm. Similarly in case of Al alloy, there is 26% increased strength for similar lap joints when length varies from 10 mm to 15 mm, while it increased to 42% when length changes from 15 mm to 25 mm and there is about 35% increase in strength for length varies from 20 mm to 25 mm. In case of dissimilar joints, firstly there is about 16% increase in strength then there is 5% decrease while after that there is 45% increase in strength. Adhesion failure, cohesion failure and mixed failure were obtained experimentally during failure mode analysis. As the strength of joint increases, failure mode shows a transition from adhesion failure to cohesion failure. From the literature survey it is evident that limited work has been carried out on analysis of shear-tensile strength of adhesively bonded steel and aluminium joint with variation in bonding parameters. Not much work on failure mode analysis of bonded joints during tensile testing has been reported. In present work a noval attempt has been made to analyze the shear-tensile strength and failure mode of adhesively bonded steel and aluminium joint with variation in bonding parameters.

Coil Failure Mode Analysis for Fiber Carbon Composite Core Rod Used in Overhead Stranded Wires

2015 ◽  
Vol 723 ◽  
pp. 7-16 ◽  
Author(s):  
Rui Li ◽  
Hong Yun Yu ◽  
Miao Qian ◽  
Min Bo Yu ◽  
Guo Yong Li ◽  
...  
Keyword(s):  
Finite Element ◽  
Theoretical Basis ◽  
Failure Modes ◽  
Mechanical Performance ◽  
Carbon Composite ◽  
Test Method ◽  
Mode Analysis ◽  
Element Simulation ◽  
Failure Mode Analysis ◽  
Core Rod

This paper studies the mechanical performance of fiber carbon composite core rod under coiled condition by finite element simulation and analyzes the failure modes by coiling test, providing technical support and theoretical basis for the manufacture technique, test method, and application of fiber carbon composite core rod.

scholarly journals Experimental and Numerical Investigation on C/SiC Composite Z-Pinned/Bonded Hybrid Single-Lap Joints

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1130
Author(s):  
Yao Wang ◽  
Xiaodong Wang ◽  
Zhidong Guan ◽  
Jifeng Xu ◽  
Xia Guo
Keyword(s):  
Failure Mechanism ◽  
Composite Structures ◽  
Mechanical Performance ◽  
Failure Process ◽  
Three Dimensional ◽  
Discrete Distribution ◽  
Lap Joints ◽  
Single Lap Joints ◽  
Load Peak ◽  
Two Peaks

Z-pinned/bonded joints are great potential connection components that have been used in the 2D C/SiC composite structures; however, the hybrid joints present complex failure mechanism considering the secondary deposited SiC matrix in the clearance. Therefore, the mechanical performance and failure mechanism of the joints are investigated through experimental and numerical methods in this paper. Experiment results show that two peaks exist in the load–displacement curves. The first load peak is 2891–4172 N with the corresponding displacement of 0.10–0.15 mm, and the second load peak is 2670–2919 N with the corresponding displacement of 0.21–0.25 mm. Besides that, the secondary deposited SiC matrix exhibits discrete distribution, and it has significant effects on the failure mechanism. Validated by experimental data, the proposed three-dimensional numerical model based on modified Hashin’s criterion and fastener element can predict the mechanical performance and failure process. The numerical results indicate that the first load peak is dominated by the deposited SiC matrix near the edge, while the second peak is dominated by the z-pin and the SiC matrix near the z-pin. Moreover, the effects of the deposited SiC matrix’s strength and distribution are discussed, which is meaningful to the optimal design of C/SiC composite z-pinned/bonded hybrid single-lap joints.

Effect of Autoclave Heating and Cooling Rates on Adhesively Bonded Lightweight Material Joints

2017 ◽  
Author(s):  
Sayed A. Nassar ◽  
Marcello Tardito ◽  
Giovanni Belingardi
Keyword(s):  
Load Transfer ◽  
Peel Strength ◽  
Lap Joints ◽  
Adhesively Bonded ◽  
Lightweight Material ◽  
Single Lap Joints ◽  
Heating And Cooling ◽  
Film Adhesive ◽  
Temperature Ramp ◽  
Polyurethane Film

This study investigates the effect of the rate of autoclave heating and cooling on the performance of bonded lightweight material single lap joints (SLJ) after they have been heat cycled at high relative humidity. Two different temperature ramp rates are used for the autoclave bonding of test joints. Joint performance is assessed in terms of the load transfer capacity (LTC) and the corresponding failure mode in a tensile-shear test. Three different combinations of Aluminium and Magnesium adherends are used in test samples using aliphatic polyether (polyurethane) film adhesive. The effect of heating rate on the peel strength of cured adhesive is also investigated. Data analysis and discussion are provided.

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