Determination of Fiber Orientation Along the Length of Complex Composite Structures Subjected to Internal Pressure and Axial Loading

2012 ◽  
Author(s):  
Rifat Hossain ◽  
Pierre Mertiny ◽  
Jason Carey
Keyword(s):  
Internal Pressure ◽  
Composite Structure ◽  
Fiber Orientation ◽  
Composite Structures ◽  
Axial Loading ◽  
Pressure Vessels ◽  
Variable Cross ◽  
Loading Conditions ◽  
Axially Symmetric ◽  
Fiber Angle

Axially symmetric fiber-reinforced polymer composite structures such as pressure vessels and piping are being widely used in different industrial applications where combined loading conditions may be applied. It is imperative to determine a suitable fiber angle, or a distribution of fiber angles, along the longitudinal direction of the structure in order to achieve best performance in terms of mechanical behavior and strength for structures subjected to combined loadings. To this end, a theoretical study was conducted providing the relationship between the fiber orientation and the loading conditions applied to a composite structure. The aim of this study is to determine the fiber angle variation along the length of an axially symmetric composite structure with variable cross-section considering different ratios of axial loading and internal pressure. As an initial step, netting analysis design theory was implemented in the present study.

Framework for a Combined Netting Analysis and Tsai-Wu-Based Design Approach for Braided and Filament-Wound Composites

2013 ◽  
Vol 135 (3) ◽  
Author(s):  
Rifat Hossain ◽  
Jason P. Carey ◽  
Pierre Mertiny
Keyword(s):  
Composite Structures ◽  
Longitudinal Direction ◽  
Industrial Applications ◽  
Pressure Vessels ◽  
Design Tool ◽  
Combined Loading ◽  
Axially Symmetric ◽  
Reinforced Polymer ◽  
Failure Theory ◽  
Filament Wound

Axially symmetric fiber-reinforced polymer composite structures, such as pressure vessels and piping, are being widely used in different industrial applications where combined loading conditions may be applied. It is imperative to determine a suitable fiber angle, or a distribution of fiber angles, along the longitudinal direction of the structure in order to achieve best performance in terms of mechanical behavior and strength for structures subjected to combined loadings. To this end, an approach combining netting analysis and Tsai-Wu failure theory was employed as a design tool to assess critical fiber angles at which applied loadings would cause a structure to fail. Together, the proposed netting analysis and failure theory-based approach constitute a simple, expedient, and convenient design process for complex-shaped structures.

Limit Load Finite Element Analysis of Thick-Walled Cylinders with Surface Cracks under Combined Internal Pressure and Axial Tension

2011 ◽  
Vol 341-342 ◽  
pp. 416-420 ◽  
Author(s):  
Mahdi Maarefdoust ◽  
Pooria Akbarzade
Keyword(s):  
Finite Element ◽  
Internal Pressure ◽  
Surface Defects ◽  
Axial Loading ◽  
Limit Load ◽  
Pressure Vessels ◽  
Element Analysis ◽  
Integrity Assessment ◽  
Applied Loading ◽  
Approximate Analytical Solutions

Limit load analysis of defect free thick walled pipes and cylinders subjected to internal pressure and combined internal pressure and axial loading is commonly performed as part of integrity assessment procedures for transmission pipelines and pressure vessels across the industry. Moreover the potential impact of environmental assisted or accidental damage that result in creation of surface defects and consequently affects the ability of vessel to withstand the applied loading conditions. This paper attempts to demonstrate the effect of surface defects on the limit load of cylinders by use of finite element method. ABAQUS software has been used for FE analysis and modeling. Approximate analytical solutions for benchmark model have been used for validation/verification of numerical results.

Braiding: A New Production Method Approach for Composite Pressure Vessels in Automotive Applications

2014 ◽  
Author(s):  
Michael Lengersdorf ◽  
Jörg Multhoff ◽  
Thomas Gries
Keyword(s):  
Pressure Vessel ◽  
Composite Structure ◽  
Fracture Resistance ◽  
Composite Structures ◽  
Production Method ◽  
Pressure Vessels ◽  
Filament Winding ◽  
Hydrogen Fuel Cell ◽  
Automotive Applications ◽  
New Production

With the first serial production of a hydrogen fuel cell car announced to enter the market in 2015, there is a prospective mass market for mobile pressure vessel applications. In automotive applications three factors are mainly decisive for a successful integration: low weight, a competitive price range and a safe operation implementation. Composite vessels can fulfill these demands. State-of-the art for the production of the composite structure is wet-filament winding. It is well established for smaller production volumes. However the potential of rise in output is limited. In filament winding only a limited number of usually 1–10 fibres is layed onto a mandrel at once. Braiding in comparison allows the simultaneously deposition of a multitude of fibres, standard machinery allow braiding of more than 200 fibres. A filament wound composite structure lacks fracture resistance under certain load cases. Composite structures known to have better fracture resistance are interlaced fibre architectures, such as braid. This applies especially for impact performance [7]. The braiding process strongly depends on the desired product. The machinery has to be chosen accordingly to application regarding e.g. the number of fibre carriers and their quantities. In automotive applications the dimensions are limited to a certain range due to available build space in the car. This paper will show which parameters have to be considered when setting up a production line for braided pressure vessels. This is done against the background of typical pressure vessel dimensions in automotive applications.

Realistic Modeling of the Failure of Composite Pipes Under Ring Deflection and Internal Pressure Loading Conditions

2011 ◽  
Author(s):  
Hugo Faria
Keyword(s):  
Internal Pressure ◽  
Composite Structures ◽  
Numerical Models ◽  
Load Level ◽  
Loading Conditions ◽  
Cohesive Elements ◽  
Damage Mechanisms ◽  
Glass Fiber Reinforced Plastic ◽  
Transverse Fiber ◽  
Composite Pipes

Realistic numerical models of the behavior of glass-fiber reinforced plastic (GFRP) pipes under two loading conditions — ring deflection and internal pressure — representative of their typical applications were developed and experimentally validated. A 2D modeling approach was implemented, using cohesive elements to accurately represent at the layer/laminate level the damage mechanisms leading to failure of these composite structures and estimate their ultimate strength under those loading conditions. The innovative and advantageous feature of these models is their ability to identify the load level at which damage is initiated, its location and the way it propagates thus giving a realistic assessment to the composite pipes’ behavior. Inter-layer delamination and transverse fiber breakage were identified as main damage mechanisms occurring up to the catastrophic failure of the pipes. The numerical-experimental procedure conducted in this study allowed also to determine the proper values of material’s physical properties such as inter- and intra-layer energy release rates governing the failure mechanisms.

scholarly journals Studies on the Geometrical Design of Spider Webs for Reinforced Composite Structures

2021 ◽  
Vol 5 (2) ◽  
pp. 57
Author(s):  
Yohannes Regassa ◽  
Hirpa G. Lemu ◽  
Belete Sirabizuh ◽  
Samuel Rahimeto
Keyword(s):  
Fiber Orientation ◽  
Composite Structures ◽  
Spider Silk ◽  
Pressure Vessels ◽  
Aviation Industry ◽  
Measurement Tool ◽  
Spider Webs ◽  
Spider Web ◽  
Reinforced Composite ◽  
Structural Applications

Spider silk is an astonishingly tough biomaterial that consists almost entirely of large proteins. Studying the secrets behind the high strength nature of spider webs is very challenging due to their miniature size. In spite of their complex nature, researchers have always been inspired to mimic Nature for developing new products or enhancing the performance of existing technologies. Accordingly, the spider web can be taken as a model for optimal fiber orientation for composite materials to be used in critical structural applications. In this study an attempt is made to analyze the geometrical characteristics of the web construction building units such as spirals and radials. As a measurement tool, we have used a developed MATLAB algorithm code for measuring the node to node of rings and radials angle of orientation. Spider web image samples were collected randomly from an ecological niche with black background sample collection tools. The study shows that the radial angle of orientation is 12.7 degrees with 5 mm distance for the spirals’ mesh size. The extracted geometrical numeric values from the spider web show moderately skewed statistical data. The study sheds light on spider web utilization to develop an optimized fiber orientation reinforced composite structure for constructing, for instance, shell structures, pressure vessels and fuselage cones for the aviation industry.

scholarly journals Morphing Hydrofoil Model Driven by Compliant Composite Structure and Internal Pressure

2019 ◽  
Vol 7 (12) ◽  
pp. 423 ◽  
Author(s):  
Fatiha Mohammed Arab ◽  
Benoît Augier ◽  
François Deniset ◽  
Pascal Casari ◽  
Jacques André Astolfi
Keyword(s):  
Internal Pressure ◽  
Composite Structure ◽  
Composite Structures ◽  
Flow Model ◽  
Hydrodynamic Forces ◽  
Hydrodynamic Performance ◽  
Naval Academy ◽  
Cavitation Inception ◽  
Model Driven ◽  
Cavitation Tunnel

In this work, a collaborative experimental study has been conducted to assess the effect an imposed internal pressure has on the controlling the hydrodynamic performance of a compliant composite hydrofoil. It was expected that the internal pressure together with composite structures be suitable to control the hydrodynamic forces as well as cavitation inception and development. A new concept of morphing hydrofoil was developed and tested in the cavitation tunnel at the French Naval Academy Research Institute. The experiments were based on the measurements of hydrodynamic forces and hydrofoil deformations under various conditions of internal pressure. The effect on cavitation inception was studied too. In parallel to this experiment, a 2D numerical tool was developed in order to assist the design of the compliant hydrofoil shape. Numerically, the fluid-structure coupling is based on an iterative method under a small perturbation hypothesis. The flow model is based on a panel method and a boundary layer formulation and was coupled with a finite-element method for the structure. It is shown that pressure driven compliant composite structure is suitable to some extent to control the hydrodynamic forces, allowing the operational domain of the compliant hydrofoil to be extended according to the angle of attack and the internal pressure. In addition, the effect on the cavitation inception is pointed out.

Joint strength of gasketed bolted pipe flange joint under combined internal pressure plus axial load with different (industrial and ASME) bolt-up strategy

2015 ◽  
Vol 231 (3) ◽  
pp. 555-564 ◽  
Author(s):  
Niaz B Khan ◽  
Muhammad Abid ◽  
Mohammed Jameel ◽  
Hafiz Abdul Wajid
Keyword(s):  
Internal Pressure ◽  
Axial Loading ◽  
Pressure Vessels ◽  
Bolted Joints ◽  
Combined Loading ◽  
Element Analysis ◽  
Design Procedures ◽  
Sealing Failure ◽  
Bolted Flange ◽  
Pipe Joint

Gasketed bolted flange joints are used in process industry for connecting pressure vessels and pipes. Design procedures available in the literature mostly discuss structural strength, while sealing failure is still a big concern in industries. Similarly, limited work is found in the literature regarding performance of gasketed bolted joints under combined loading. A detailed 3D nonlinear finite element analysis is performed to study the strength and sealing of a gasketed bolted flanged pipe joint under different bolt-up strategy (Industrial and ASME) and under combined internal pressure and axial loading.

FIRE RESISTACE OF SHEAR CONNECTORS FOR COMPOSITE BEAMS

2020 ◽  
Vol 92 (6) ◽  
pp. 59-65
Author(s):  
G.P. TONKIH ◽  
◽  
D.A. CHESNOKOV ◽  
◽  
Keyword(s):  
Fire Resistance ◽  
Composite Structure ◽  
Composite Structures ◽  
Composite Beams ◽  
Design Codes ◽  
Connection Strength ◽  
Shear Connectors ◽  
Shear Connection ◽  
Capacity Reduction ◽  
Russian Research

Most of Russian research about composite structure fire resistance are dedicated to the composite slab behavior. The composite beams fire resistance had been never investigated in enough volume: the temperature evaluation within the scope of the actual Russian design codes leads to the significant reduction in the shear connection strength. Meanwhile, there no correlation between the strength decreasing and type of the shear connection. The article provides an overview of the relevant researches and offers some approaches which could take into account bearing capacity reduction of the shear connectors within composite structures design.

scholarly journals High Performance NbMoTa–Al2O3 Multilayer Composite Structure Manufacturing by Laser Directed Energy Deposition

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1685
Author(s):  
Hang Zhang ◽  
Zihao Chen ◽  
Yaoyao He ◽  
Xin Guo ◽  
Qingyu Li ◽  
...  
Keyword(s):  
Smart Materials ◽  
Composite Structure ◽  
Composite Structures ◽  
High Performance ◽  
Energy Deposition ◽  
Coefficient Of Thermal Expansion ◽  
Multilayer Composite ◽  
Forming Process ◽  
Directed Energy Deposition ◽  
Directed Energy

The conventional method of preparing metal–ceramic composite structures causes delamination and cracking defects due to differences in the composite structures’ properties, such as the coefficient of thermal expansion between metal and ceramic materials. Laser-directed energy deposition (LDED) technology has a unique advantage in that the composition of the materials can be changed during the forming process. This technique can overcome existing problems by forming composite structures. In this study, a multilayer composite structure was prepared using LDED technology, and different materials were deposited with their own appropriate process parameters. A layer of Al2O3 ceramic was deposited first, and then three layers of a NbMoTa multi-principal element alloy (MPEA) were deposited as a single composite structural unit. A specimen of the NbMoTa–Al2O3 multilayer composite structure, composed of multiple composite structural units, was formed on the upper surface of a φ20 mm × 60 mm cylinder. The wear resistance was improved by 55% compared to the NbMoTa. The resistivity was 1.55 × 10−5 Ω × m in the parallel forming direction and 1.29 × 10−7 Ω × m in the vertical forming direction. A new, electrically anisotropic material was successfully obtained, and this study provides experimental methods and data for the preparation of smart materials and new sensors.

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