Multi-scale elastoplastic mechanical model and microstructure damage analysis of solid expandable tubular

2020 ◽  
Vol 29 (10) ◽  
pp. 104602
Author(s):  
Hui-Juan Guo ◽  
Ying-Hua Liu ◽  
Yi-Nao Su ◽  
Quan-Li Zhang ◽  
Guo-Dong Zhan
Keyword(s):  
Mechanical Model ◽  
Damage Analysis ◽  
Multi Scale

Micro Mechanical Model of Filament Wound Composite Pipe With Damage Analysis

2006 ◽  
Author(s):  
Chuwei Zhou ◽  
Zihui Xia ◽  
Qiaoling Yong
Keyword(s):  
Structural Analysis ◽  
Mechanical Model ◽  
Local Stress ◽  
Filament Winding ◽  
Low Velocity Impact ◽  
Damage Analysis ◽  
Low Velocity ◽  
Filament Wound ◽  
Composite Pipes ◽  
Structural Scale

Filament winding (FW) is one of the most common techniques for manufacturing composite pipes. The material properties and failure mechanism of composite pipes depend largely on winding pattern. In this study a micro mechanical approach for filament wound composites (FWCs) is pursued. A diamond-shaped repeated unit cell (RUC) is first constructed which characterizes the micro architecture of FWC pipe, such as winding angel, shift between successive circuits and the area of local undulation region. The micro mechanical model is embedded into commercial FEM code of ABAQUS as user-defined subroutine thus the link between the analyses in macro engineering structural scale and in micro material structural scale is established. By averaging micro stiffness constants over the cell macro ones needed for engineering structural analysis can be obtained. On the other hand, the macro structural analysis provides average stresses/strains of the cell locating at any concerned region of the macro structure for local stress and damage analysis. Effects of tow undulation caused by tow crossover on micro stresses are taken into accounted. The model is applied to glass/epoxy wound pipes with various winding angles and winding shifts. Mechanical properties are predicted and damage evolutions are simulated. The effects of delamination damage, usually introduced by lateral low velocity impact, on stiffness and ultimate strength of FWC pipe are also investigated.

Multi-scale damage analysis and fatigue behavior of PLA manufactured by fused deposition modeling (FDM)

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Hamid Reza Vanaei ◽  
Mohammadali Shirinbayan ◽  
Saeedeh Vanaei ◽  
Joseph Fitoussi ◽  
Sofiane Khelladi ◽  
...  
Keyword(s):  
Fused Deposition Modeling ◽  
Coupling Effect ◽  
Fatigue Behavior ◽  
Loading Frequency ◽  
Damage Analysis ◽  
Fatigue Lifetime ◽  
Content Type ◽  
Multi Scale ◽  
Fused Deposition ◽  
Deposition Modeling

Purpose Fused deposition modeling (FDM) draws particular attention due to its ability to fabricate components directly from a CAD data; however, the mechanical properties of the produced pieces are limited. This paper aims to present the experimental aspect of multi-scale damage analysis and fatigue behavior of polylactic acid (PLA) manufactured by FDM. The main purpose of this paper is to analyze the effect of extruder temperature during the process, loading amplitude, and frequency on fatigue behavior. Design/methodology/approach Three specific case studies were analyzed and compared with spool material for understanding the effect of bonding formation: single printed filament, two printed filaments and three printed filaments. Specific experiments of quasi-static tensile tests coupled with microstructure observations are performed to multi-scale damage analysis. A strong variation of fatigue strength as a function of the loading amplitude, frequency and extruder temperature is also presented. Findings The obtained experimental results show the first observed damage phenomenon corresponds to the inter-layer bonding of the filament interface at the stress value of 40 MPa. For instance, fatigue lifetime clearly depends on the extruder temperature and the loading frequency. Moreover, when the frequency is 80 Hz, the coupling effect of thermal and mechanical fatigue causes self-heating which decreases the fatigue lifetime. Originality/value This paper comprises useful data regarding the mechanical behavior and fatigue lifetime of FDM made PLA specimens. In fact, it evaluates the effect of process parameters (extruder temperature) based on the nature of FDM that is classified as a thermally-driven process.

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