Failure Behavior of Aircraft Sandwich Panels under Bending Load

2015 ◽  
Vol 754-755 ◽  
pp. 844-848
Author(s):  
Haftirman ◽  
K.S. Basaruddin ◽  
A.R. Syayuthi ◽  
M.S. Fartini
Keyword(s):  
Energy Absorption ◽  
Sandwich Panels ◽  
Standard Test ◽  
Test Method ◽  
Bending Test ◽  
Failure Behavior ◽  
Collapse Mechanism ◽  
Span Length ◽  
Bending Load ◽  
Effect Of Support

Failure behavior of aircraft sandwich panels under bending load has been investigated in this study. In this study focused in effect of support span length under bending load. Three-points bending test was performed to the specimens with various span length 125 mm, 80 mm, 70 mm, and 55 mm. Standard test method and dimensions were adhering to the ASTM C393. Deflection and energy absorption of the sandwich panels have been characterized by the variation span lengths.It was found that the deflection and the energy absorption of the sandwich panels were strongly influenced by the length of support span. In the bending test of sandwich panels at 125 mm support span length, the panel possess the lowest deflection at a critical load which is around 3.26 mm compared to the other support span length. The differences of the collapse load for 55 mm support span length is highly significant. The value of experimental was found at 1.54 kN whereas the theoretical value is 2.65 kN The ability to absorb energy of sandwich panels was affected by the collapse mechanism. It was found that the decrease of support span length increases the absorbed energy in the aircraft sandwich panel.

Investigation of Flexure Strength on Carbon Fiber Reinforced Epoxy (CFRE) for Aircraft Panel

2015 ◽  
Vol 786 ◽  
pp. 79-83
Author(s):  
A.R. Syayuthi ◽  
Haftirman ◽  
K.S. Basaruddin ◽  
M.S. Abdul Manan
Keyword(s):  
Carbon Fiber ◽  
Crack Length ◽  
Sandwich Panels ◽  
Strain Curve ◽  
Thickness Ratio ◽  
Bending Test ◽  
Fiber Reinforced ◽  
Flexure Strength ◽  
Bending Load ◽  
Carbon Fiber Reinforced

Failure behaviour of aircraft sandwich panels under bending load has been investigated in this study. Three-points bending test was performed to the specimens with various span-to-thickness (S/d) ratios 32, 40, and 60. Testing method and dimension of specimens were adhering to the American Society for Testing and Materials (ASTM) D-790M. Deflection and energy absorption of the sandwich panels was characterized by specific span-to-thickness (S/d) ratios. It was found that specimen with S/d of 40 has the steepest slope in stress-strain curve and specimen with S/d of 32 has the highest flexure strength, 831MPa. The flexure strength decreases with the increasing of span-to-thickness ratio. The result shows that the increasing of the span-to-thickness ratio increased the crack length at the lowest maximum bending stress, 636 MPa. The results suggest that the performance of the Carbon Fiber Reinforced Epoxy (CFRE) composites is strongly influenced by the crack length.

Reliability Evaluation of Lead Free Solder Joints Subjected to Multi-Loads

2007 ◽  
Author(s):  
Akihiko Tosaka ◽  
Qiang Yu ◽  
Tadahiro Shibutani ◽  
Satoshi Kondo ◽  
Masaki Shiratori
Keyword(s):  
Solder Joints ◽  
Electronic Device ◽  
Cyclic Fatigue ◽  
Reliability Evaluation ◽  
Test Method ◽  
Bending Test ◽  
Fatigue Reliability ◽  
Bending Load ◽  
Reliability Of Solder Joints ◽  
Free Solder

The miniaturization and the high integration of electronic device parts were progressed by the advance in technology, and it leads the problems of warpage of high-integrated component during mounting processes. This kind mismatch would be released slowly after the components are assembled. Therefore, it is concerned that the deformation of the solder joints caused by the warpage should give some impact on the thermal fatigue reliability of solder joints, because the solder joints are subjected not only to the cyclic thermal mismatch but also to the considerable one direction bending load. This state is called as multi-loads in this study. The thermal cyclic fatigue reliability of solder joints had been studied by using analytical and heat cyclic testing approaches, and it is shown that the fatigue life can be assessed by Manson-Coffin’s law. However, the reliability evaluation techniques for multi-loads problem have not been established. In this study, the relation between the fatigue reliability and the multi-loads conditions was studied and the BGA (Ball Grid Array) package was chosen as the target. The author proposed a new cyclic bending test method to achieve the different conditions of the multi-loads, and based upon the experimented and analytical results it was found that impact of the multi loads some cases neglected for could not be.

Bending Properties of Five-Layer Biaxial Weft Knitted Fabric Reinforced Composite Materials

2011 ◽  
Vol 391-392 ◽  
pp. 359-363 ◽  
Author(s):  
Wei Geng ◽  
Ye Xiong Qi ◽  
Jia Lu Li
Keyword(s):  
Composite Materials ◽  
Fiber Volume Fraction ◽  
Bending Strength ◽  
Volume Fraction ◽  
Test Method ◽  
Bending Test ◽  
Bending Properties ◽  
Fiber Volume ◽  
Reinforced Composite ◽  
Bending Load

Five-layer biaxial weft knitted (FBWK) fabric is one kind of multilayered biaxial weft knitted (MBWK) fabric. FBWK fabric is made of carbon fiber as inserted yarns and stitched with polyester yarns, and it has been impregnated with epoxy via resin transfer molding (RTM) technique to manufacture the composite plates. The bending properties of the FBWK fabric reinforced composite are studied with the three-point bending test method. The bending properties of the FBWK fabric reinforced composite materials with different fiber volume fraction have been investigated. The results show that the relationship between bending load and deflection is obviously linear before reaching the maximum load. Within a certain range, the bending strength of this kind of composites increases with the fiber volume fraction increasing. When the fiber volume fraction is 57%, the bending strength is 1051.4 MPa.

Experimental Analysis of Bending and Axial Crush Behaviour of Single Hat Longitudinal Rail

2013 ◽  
Vol 569-570 ◽  
pp. 398-405
Author(s):  
Nurulakmar Abu Husain ◽  
Chi Loog Pang
Keyword(s):  
Energy Absorption ◽  
Compressive Load ◽  
Bending Test ◽  
Bottom Surface ◽  
Tensile Behaviour ◽  
Deformation Pattern ◽  
Displacement Curve ◽  
Displacement Response ◽  
Bending Load ◽  
Load Displacement

This paper deals with experimental investigations of single hat longitudinal rail under quasi-static crush loading. A set of identical specimen which was simplified from actual automotive longitudinal rail was fabricated, and quasi-static testing (i.e., compression and bending test) were conducted. The main objective of this research was to study the failure mode, bending and tensile behaviour of the structure under bending and axial compression. In order to get the compressive load-displacement response and its corresponding deformation pattern, the compression test was carried out using a Universal Testing Machine. Stress-strain curve and energy absorption of the specimen were derived from the compressive load-displacement response. It was found that the quasi-static response of the specimen in compression case was affected by the number and position of spot welds. For the bending test, the bending load was found to be fluctuated with the displacement in a way analogous to the folding behaviour and deformation of the cross-section of the specimen. Bending moment-rotation characteristic was derived from bending load-displacement curve to investigate the energy absorption of the specimen in bending case. Lastly, the von Mises stress at the top and bottom surface of the specimen is increased with increment of the punch head travel distance.

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