Study on Aluminum Alloy Helicopter Deck under Static Loads

2014 ◽  
Vol 926-930 ◽  
pp. 889-895
Author(s):  
An Tao Feng ◽  
Xin Gang Zhou
Keyword(s):  
Aluminum Alloy ◽  
Sandwich Panel ◽  
Static Load ◽  
Mechanical Performance ◽  
Fem Simulation ◽  
Fem Analysis ◽  
Test Results ◽  
Compressive Loads ◽  
Ultimate Load Carrying Capacity ◽  
Load Conditions

Test and study of aluminum alloy helicopter deck under static load were carried out. The deck is made of aluminum alloy sandwich panel. In the experiment, the deflection and stress of deck are measured under different static load conditions. Load conditions are determined by the conditions that helicopter berths at the deck. When helicopter berths at the deck, the deck endures vertical compressive loads on the deck surface and diagonal tension loads on the tie-down rod which is used to fasten the helicopter. According to the test results under different load conditions, the characteristic behavior and ultimate load carrying capacity were analyzed. Based on experimental results, FEM simulation was made. The results of FEM analysis was agreed with the test results very well. It is shown that the helicopter deck which is composed of aluminum alloy sandwich panel has good mechanical performance.

Residual compressive strength of aluminum alloy honeycomb sandwich panel in the presence of multiple impact dents

2021 ◽  
pp. 109963622110369
Author(s):  
Fawad Tariq ◽  
Muhammad Uzair ◽  
Madni Shifa
Keyword(s):  
Compressive Strength ◽  
Aluminum Alloy ◽  
Sandwich Panel ◽  
Structural Integrity ◽  
Mechanical Performance ◽  
Impact Damage ◽  
Honeycomb Structure ◽  
Residual Compressive Strength ◽  
Honeycomb Sandwich ◽  
Aluminum Alloy Honeycomb

The present article discusses the effect of impact damage on residual compressive strength of aluminum alloy honeycomb sandwich panel (HSP). Multiple dents were created in HSP by penetrating indenters of different diameters through quasi-static indentation technique. The damaged samples were compressed edge-wise for determination of in-plane compression after impact (CAI) strength. The failed samples were macroscopically examined to reveal the underlying damage mode. Experimental results showed that the presence of multiple dents of 5 mm size or less do not appreciably affect the CAI strength of aluminum alloy HSP. However, moderate reduction in CAI strength was observed in case of multiple dents of 10 mm. Compressive strength was reduced by 18% in presence of four dents of 10 mm diameter. The maximum reduction in CAI strength of up to 30% was observed in samples impact damaged by 15 mm indenter. Examination of failed HSP showed that the maximum load was sustained taken by aluminum facesheet whereas the contribution of honeycomb core was insignificant. Research findings exhibit that the CAI strength of aluminum alloy honeycomb structure is not sensitive to impact damages size less than 5 mm diameter however dents above 5 mm size can seriously impair mechanical performance and structural integrity.

Shearing Fracture Mechanism of Foam Aluminum Sandwich

2012 ◽  
Vol 482-484 ◽  
pp. 1037-1040
Author(s):  
Min Zhang ◽  
Chang Jun Chen ◽  
Guo Yin Zu ◽  
Guang Chun Yao
Keyword(s):  
Aluminum Alloy ◽  
Fracture Mechanism ◽  
Sandwich Panel ◽  
Failure Modes ◽  
Pore Wall ◽  
Fracture Pattern ◽  
Aluminum Sheet ◽  
Foam Core ◽  
Test Results ◽  
Foam Aluminum

Core cracking and face/core separation (debonding) are common failure modes in foam cored sandwich structures, aluminum alloy foam sandwich is prepared in this experiment, shearing tests were conducted on precursor and sandwich panel specimens. Shearing test results showed if the porosity was not uniform and have super-big pores, the interface was not firmly；and porosity was uniform, so the bonding interface was tightly and under force the strength of aluminum sheet was lower than the foam core/aluminum sheet interface. Analysis the results fracture pattern of aluminum sheet/powders interface belongs to interface brittle debonding; and if the strength of pore wall was lower than aluminum face sheet, fracture pattern of foam core/aluminum sheet began ductile and transited to cleavages fracture.

In-Plane Flexible Ring Tire Model—Part 1: Modeling and Parameter Identification

2018 ◽  
Vol 46 (3) ◽  
pp. 174-219 ◽  
Author(s):  
Bin Li ◽  
Xiaobo Yang ◽  
James Yang ◽  
Yunqing Zhang ◽  
Zeyu Ma
Keyword(s):  
Static Load ◽  
Model Parameters ◽  
Tire Model ◽  
Test Results ◽  
Lumped Mass ◽  
Virtual Test ◽  
Proposed Model ◽  
Particle Swarm Method ◽  
Vehicle Dynamic Simulation ◽  
Flexible Ring

ABSTRACT The tire model is essential for accurate and efficient vehicle dynamic simulation. In this article, an in-plane flexible ring tire model is proposed, in which the tire is composed of a rigid rim, a number of discretized lumped mass belt points, and numerous massless tread blocks attached on the belt. One set of tire model parameters is identified by approaching the predicted results with ADAMS® FTire virtual test results for one particular cleat test through the particle swarm method using MATLAB®. Based on the identified parameters, the tire model is further validated by comparing the predicted results with FTire for the static load-deflection tests and other cleat tests. Finally, several important aspects regarding the proposed model are discussed.

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.

scholarly journals Experimental Investigation on Composite Deck Slab Made of Cold-Formed Profiled Steel Sheeting

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 229
Author(s):  
Siva Avudaiappan ◽  
Erick I. Saavedra Flores ◽  
Gerardo Araya-Letelier ◽  
Walter Jonathan Thomas ◽  
Sudharshan N. Raman ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Test Results ◽  
Shear Connectors ◽  
Modes Of Failure ◽  
Deck Slabs ◽  
Load Carrying ◽  
Composite Slabs ◽  
Ultimate Load Carrying Capacity ◽  
Ductility Ratio ◽  
Deck Slab

An experimental investigation is performed on various cold-formed profiled sheets to study the connection behavior of composite deck slab actions using bolted shear connectors. Various profiles like dovetailed (or) re-entrant profiles, rectangular profiles and trapezoidal profiles are used in the present investigation. This experimental investigation deals with the evaluation of various parameters such as the ultimate load carrying capacity versus deflection, load versus slip, ductility ratio, strain energy and modes of failure in composite slab specimens with varying profiles. From the test results the performance of dovetailed profiled composite slabs’ resistance is significantly higher than the other two profiled composite deck slabs.

scholarly journals FEM Analysis of Spring-backs in Age Forming of Aluminum Alloy Plates

2007 ◽  
Vol 20 (6) ◽  
pp. 564-569 ◽  
Author(s):  
Huang Lina ◽  
Wan Mina ◽  
Chi Cailoub ◽  
Ji Xiushengb
Keyword(s):  
Aluminum Alloy ◽  
Fem Analysis

The Study on Fatigue Life of Interconnect with Respect to Geometrical Shape of Supporting Structure and Load Conditions in MEMS

2005 ◽  
Vol 297-300 ◽  
pp. 539-544
Author(s):  
Jae Joon Shim ◽  
Geun Jo Han ◽  
Kwang Young Kim ◽  
Doo Pyo Yun ◽  
Chul Ho Ok ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Critical Temperature ◽  
Thermal Load ◽  
Fem Simulation ◽  
Geometrical Shape ◽  
Operating Life ◽  
Batch Production ◽  
Supporting Structure ◽  
External Conditions ◽  
Load Conditions

Recently, application of semiconductor sensors has widely spreaded into various industries becasuse those have several merits like easy miniaturization and batch production etc. But external conditions such as thermal and repetitive load have a bad effect on sensors’s lifetime. Therefore, lots of studies related with the fatigue of microelectromechnical systems (MEMS) have been conducted. Especially, this paper was focused on fatigue life of aluminum interconnect in the supporting structure of sensor under cyclic thermal load and on the approximation equation defining the critical temperature to ensure required operating life using FEM simulation.

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