Bolted Joint Analyses for Composite Structures — Current Empirical Methods and Future Scientific Prospects

2008 ◽  
pp. 127-127-34 ◽  
Author(s):  
LJ Hart-Smith
Keyword(s):  
Composite Structures ◽  
Bolted Joint ◽  
Empirical Methods

scholarly journals Composite Single-Bolted Joint Simulation for Dynamic Strength Prediction

Proceedings ◽  
2018 ◽  
Vol 2 (8) ◽  
pp. 512
Author(s):  
Zeliang Yu ◽  
Pu Xue ◽  
Yue Chen
Keyword(s):  
Composite Structures ◽  
Dynamic Properties ◽  
Dynamic Strength ◽  
Structural Deformation ◽  
Engineering Practice ◽  
Three Dimension ◽  
Bolted Joint ◽  
Finite Element Software ◽  
Composite Joint ◽  
Significant Difference

Composite material has been widely used in various fields for its high specific strength and high specific stiffness, so the connectors applicable to composite structures capture many researchers’ attention. With the advantages of higher carrying capacity and repetitive assembling and disassembling, bolted joint becomes one of the most popular connectors in engineering practice. Cutting off the fiber and causing stress concentration are more serious to composite than metal, so it is necessary to predict the strength of the composite joints. Most investigations focus on the response under quasi-static loading, while dynamic effects should be in consideration in increasing impact conditions. The dynamic mechanical properties of composite joint may have a significant impact on the structural deformation and damage modes. For this purpose, this paper conducts dynamic composite single-bolted joint simulations in ABAQUS/Explicit, which used for predicting dynamic strength of the composite joint. T800/X850 laminates were tested to investigate their dynamic properties in our lab. Then the three-dimension progression damage model was established, while the dynamic constitutive model, damage initial criteria and damage evolution law of composite materials were coded in VUMAT of the finite element software ABAQUS/Explicit. The model was validated by quasi-static experiments of composite joint. The simulation results indicate that the yield strength and ultimate strength of the single-bolted composite joint are obviously increasing when consider the strain rate effect and dynamic loading. And the load-displacement curves show significant difference in damage stage. The main damages are sub-layer buckling and fiber breakage caused by extrusion.

Strength of Composite Laminated Bolted Joint Subjected to a Clamping Force

2006 ◽  
Vol 326-328 ◽  
pp. 1777-1780
Author(s):  
Jin Ho Choi ◽  
Young Hwan Lee ◽  
Jin Hwe Kweon ◽  
Woo Seong Che
Keyword(s):  
Composite Structures ◽  
Research Area ◽  
Experimental Results ◽  
Clamping Force ◽  
Bolted Joint ◽  
Important Research ◽  
Index Method ◽  
Area Index ◽  
Composite Joint ◽  
Important Research Area

As these composites have become more popular, composite joint design has become a very important research area, as these joints are often the weakest parts of composite structures. In this paper, the strength of a composite laminated bolted joint being subjected to a clamping force was tested and predicted using the FAI (Failure Area Index) method. The strengths of composite joints subjected to clamping forces on different geometric shapes and dimensions were predicted using the FAI method, and the results were compared with experimental results. From the tests and analyses, the strength of a given composite laminated bolted joint subjected to a clamping force could be predicted within 22.5% via the FAI method.

Fiber Reinforced Composite Structure with Bolted Joint – A Review

2011 ◽  
Vol 471-472 ◽  
pp. 939-944 ◽  
Author(s):  
Khudhayer J. Jadee ◽  
A.R. Othman
Keyword(s):  
Composite Structure ◽  
Composite Structures ◽  
High Strength ◽  
Strength Properties ◽  
Bolted Joints ◽  
Bolted Joint ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Reliable Design

Fiber reinforced composite structures are widely used in the aerospace, aircraft, civil and automotive applications due to their high strength-to-weight and stiffness-to-weight ratios and these applications require joining composite either to composite or to metal. There are three main methods for joining composite structures namely, bonding, mechanically fastened or a combination of the two. Bolted joint are preferred in structures where the disassembly is required for the purpose of maintenance and repair. Due to the stress concentration around the holes, bolted joints often represents the weakest part in the structure, and therefore it is important to design them safely. A review on the study of bolted joints in fiber reinforced composite structure is presented. It was found that the behavior of bolted joints in composite structure is affected by many factors, such as geometry, joint material, clamping–load provided by the bolts, ply orientations, etc. Accordingly, various researches have been conducted on the analyses of stress distribution, failure prediction, and strength properties of bolted joint both experimentally and numerically. Accurate prediction of stresses in bolted joints is essential for reliable design of the whole structure; if it is not optimally designed, premature and unexpected failures may be occurred.

scholarly journals Progressive fatigue damage analysis of composite bolted joint using equivalent stress model

2019 ◽  
Vol 103 (1) ◽  
pp. 003685041987423 ◽  
Author(s):  
Fang Liu ◽  
Ming Xie ◽  
Yanjun Ji ◽  
Mengzhen Zhou
Keyword(s):  
Fatigue Life ◽  
Composite Structures ◽  
Progressive Failure ◽  
Equivalent Stress ◽  
Three Dimensional ◽  
Field Variable ◽  
Bolted Joints ◽  
Bolted Joint ◽  
Damage State ◽  
Fatigue Model

Composite bolted joints are quite necessary for composite structures connection, which has become the main limit for the use of composites in main load-bearing structures. In this article, a fatigue model of composite bolted joint based on equivalent stress is established by programming in ABAQUS USDFLD subroutine to simulate the progressive failure of composite bolted joints. By introducing three-dimensional Tsai–Hill static failure criterion, equivalent stress is calculated for investigating effects of multiaxial stress on fatigue life. In the subroutine of progressive failure for fatigue model, fatigue life of composite bolted joint and damage state of elements that are meshed in the process of modelling are connected by defining field variable. Different fatigue modes are predicted here by changing stress amplitude and ratio loading, in which simulation results agree well with that obtained in corresponding experiments.

In Situ microscopy of the anodic etching of silicon

1995 ◽  
Vol 53 ◽  
pp. 232-233
Author(s):  
Frances M. Ross ◽  
Peter C. Searson
Keyword(s):  
Composite Structures ◽  
High Surface ◽  
High Surface Area ◽  
Chemical Properties ◽  
Selective Etching ◽  
Silicon On Insulator ◽  
Second Phase ◽  
Porous Layers ◽  
New Class ◽  
Porous Semiconductors

Porous semiconductors represent a relatively new class of materials formed by the selective etching of a single or polycrystalline substrate. Although porous silicon has received considerable attention due to its novel optical properties1, porous layers can be formed in other semiconductors such as GaAs and GaP. These materials are characterised by very high surface area and by electrical, optical and chemical properties that may differ considerably from bulk. The properties depend on the pore morphology, which can be controlled by adjusting the processing conditions and the dopant concentration. A number of novel structures can be fabricated using selective etching. For example, self-supporting membranes can be made by growing pores through a wafer, films with modulated pore structure can be fabricated by varying the applied potential during growth, composite structures can be prepared by depositing a second phase into the pores and silicon-on-insulator structures can be formed by oxidising a buried porous layer. In all these applications the ability to grow nanostructures controllably is critical.

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