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.

Effect of Cyclic Heat, Humidity, and Joining Method on the Static and Dynamic Performance of Lightweight Multimaterial Single-Lap Joints

2015 ◽  
Vol 137 (5) ◽  
Author(s):  
Sayed A. Nassar ◽  
Kaori Sakai
Keyword(s):  
Relative Humidity ◽  
Load Transfer ◽  
Dynamic Performance ◽  
Load Ratio ◽  
Lap Joints ◽  
Ambient Conditions ◽  
Heat Cycling ◽  
Single Lap Joints ◽  
Glass Fiber Reinforced ◽  
Static Performance

This experimental study investigates the effect of environmental loading and joining methods on the static and dynamic performance of lightweight multimaterial single-lap joints (SLJ). Joint adherend material combinations are divided into two groups; namely, composite-based and steel-based materials that include glass fiber reinforced polymer (GFRP), steel (St), aluminum (Al), and magnesium (Mg). A commercially available adhesive is selected for the study. Investigated joining methods include bonding-only, bolting-only, and hybrid bonding-and-bolting. Static performance is assessed by the load transfer capacity (LTC) of SLJ after they have been subjected to heat cycling at ambient level of relative humidity, or after heat cycling at high relative humidity. Dynamic performance is measured by durability life (in cycles) of SLJ test samples under a fixed dynamic load ratio in a tensile–tensile fatigue test, after they have been subjected to heat cycling and humidity. The cyclic test load fluctuated between 67.5% and 75% of the static LTC at ambient condition. Sample finding includes the significant effect of heat cycling at an ambient humidity level; it has tripled the LTC of bonded-only composite-to-composite SLJ, relative to their baseline LTC at ambient conditions. Detailed discussion of the results, observations, and conclusions are presented in this paper.

Research on Static Load Tests of Damaged Bridge Strengthened with Pre-Stressed HFRP

2014 ◽  
Vol 1079-1080 ◽  
pp. 258-265
Author(s):  
Chen Ning Cai ◽  
Shan He ◽  
Li Na Liu ◽  
Shi Kun Ou
Keyword(s):  
Static Load ◽  
Flexural Rigidity ◽  
Fiber Reinforced Polymer ◽  
Test Results ◽  
Structural Members ◽  
Fiber Reinforced ◽  
Hybrid Fiber ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Load Tests

Thispaper presents an experimental study to strengthen an existing bridge usingpre-stressed carbon fiber reinforced polymer (CFRP) and glass fiber reinforced polymer(GFRP) materials. The method using pre-stressed hybrid fiber reinforced polymer(HFRP) to strengthened structural members is an emerging pre-stressed strengtheningtechnology. In this study, experimental data selected from result of staticloading test conducted to hollow slabs with CFRP/GFRP has been compared with specimenswithout strengthening. Test results showed that the strengthening methoddeveloped in this study could effectively reduce the stress in hollow slab,improving the flexural rigidity and inhibiting the concrete from fracture.

Flexural Behaviour of Glass Fiber Reinforced Polymer (GFRP) Tubes Subjected to Static Load

2021 ◽  
pp. 510-516
Author(s):  
Agusril Syamsir ◽  
Abdulrahman Alhayek ◽  
Audrey Yeow Yee Keng ◽  
Daud Mohamad ◽  
Mohamad Zakir Abd Rashid ◽  
...  
Keyword(s):  
Glass Fiber ◽  
Static Load ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Flexural Behaviour ◽  
Glass Fiber Reinforced Polymer ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced

Using GFRP to Develop the Mechanical Performance of Structural Insulated Panels

2013 ◽  
Vol 671-674 ◽  
pp. 1941-1944 ◽  
Author(s):  
Meng Jing ◽  
Werasak Raongjant
Keyword(s):  
Energy Efficient ◽  
Mechanical Performance ◽  
Fiber Reinforced Polymer ◽  
Flexural Test ◽  
Glass Fiber Reinforced Polymer ◽  
Load Bearing Capacity ◽  
Structural Insulated Panels ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Basic Understanding

As an energy efficient means of construction, structural insulated panels (SIP) are now widely used in the world. In this paper, Glass Fiber Reinforced Polymer (GFRP) sheets were used as strengthening materials in the SIPs to develop the mechanical performance of it. Eighteen specimens were constructed. Six of them were normal SIPs used as control specimens while twelve specimens were SIPs with different GFRP sheets pasted between face boards and foam cores. Compressive and flexural test programs were conducted to provide a basic understanding of the mechanical performance of this new kind of SIP panel system. The results showed that, the new kind of SIP materials behaved better load bearing capacity and better ductility.

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.

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