scholarly journals Fracture mechanics of laser sintered cracked polyamide for a new method to induce cracks by additive manufacturing

2016 ◽  
Vol 50 ◽  
pp. 301-308 ◽  
Author(s):  
T. Brugo ◽  
R. Palazzetti ◽  
S. Ciric-Kostic ◽  
X.T. Yan ◽  
G. Minak ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Fracture Mechanics ◽  
New Method

Self-Support Topology Optimization With Horizontal Overhangs for Additive Manufacturing

2020 ◽  
Vol 142 (9) ◽  
Author(s):  
Jikai Liu ◽  
Huangchao Yu
Keyword(s):  
Topology Optimization ◽  
Additive Manufacturing ◽  
Inclination Angle ◽  
The Self ◽  
New Method ◽  
Threshold Condition ◽  
Support Condition ◽  
Fused Deposition ◽  
Support Threshold ◽  
Overhang Length

Abstract Most of the existing self-support topology optimization methods restrict the overhang inclination angle to be larger than the self-support threshold value. However, for some additive manufacturing processes, such as fused deposition modeling, horizontal overhangs with zero inclination angle could be successfully printed while the overhang size plays a key role in determining the printability. Therefore, the self-support threshold condition should be re-developed to comprehensively consider the overhang size and inclination angle. At the same time, there raises the challenges of formulating the self-support constraints based on the new threshold condition. To address this difficulty, a novel method is proposed in this work to realize the design with horizontal overhangs. To be specific, the new method employs a skeleton-based structure decomposition approach to divide the structure into components based on the connectivity condition. Then, each component will be evaluated about its self-support status based on its overhang length and inclination angle. Finally, the self-support constraint will be activated only for those components that violate the threshold condition. An excellent feature of the method is that it can be adapted to address the only inclination angle self-support condition, or the comprehensive self-support condition that simultaneously considers the overhang length and inclination angle. Therefore, the new method serves for general applications to different additive manufacturing (AM) processes. Numerical examples will be studied to demonstrate the effectiveness of the proposed method.

scholarly journals Localized Corrosion Resistance on Additively Manufactured Ti Alloys by Means of Electrochemical Critical Localized Corrosion Potential in Biomedical Solution Environments

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7481
Author(s):  
Dong-Il Seo ◽  
Jae-Bong Lee
Keyword(s):  
Corrosion Resistance ◽  
Additive Manufacturing ◽  
Passive Film ◽  
Human Body ◽  
Corrosion Potential ◽  
New Method ◽  
Localized Corrosion ◽  
Ti Alloys ◽  
Corrosive Environments ◽  
Repassivation Kinetics

This study proposes a new method, electrochemical critical localized corrosion potential (E-CLCP), in order to evaluate localized corrosion resistance of biomedical additive manufacturing (AM) titanium (Ti) alloys. The procedures for determining E-CLCP are completely different from that of the electrochemical critically localized corrosion temperature (E-CLCT) method (ISO 22910:2020). However, its application should be limited to pH and temperature of the human body because of the temperature scan. E-CLCP displays the localized corrosion resistance of AM Ti alloys based on the human body’s repassivation kinetics, whereas E-CLCT displays the localized corrosion resistance of the alloys based on passive film breakdown in much harsher corrosive environments.

Fatigue Life Reliability Analysis of Submarine Cone-Cylinder Shell

2012 ◽  
Vol 479-481 ◽  
pp. 2001-2004
Author(s):  
Zhi Yong Zhang ◽  
Tian Shu Song ◽  
Yang He
Keyword(s):  
Monte Carlo ◽  
Fatigue Life ◽  
Monte Carlo Method ◽  
Fracture Mechanics ◽  
Reliability Analysis ◽  
The Other ◽  
New Method ◽  
Probabilistic Fracture Mechanics ◽  
Two Factors

A new method is presented in the paper. The fatigue life reliability of submarine cone-cylinder shell is investigated, based on the combination between the methods of conventional Monte Carlo and classical probabilistic fracture mechanics. Firstly, Monte Carlo method is employed to obtain the reliability of given initial fatigue life. Secondly, the two induced factors M1 and M2 in the paper are estimated according to the initial fatigue life and the reliability. Thirdly, based on the two factors, the other fatigue life reliability is obtained by using classical probabilistic fracture mechanics method. Finally, numerical cases show that the proposed method is more efficient without accuracy loss for fatigue life reliability compared with Monte Carlo method. This method can also be applied to predict the fatigue life reliability of analogue structures.

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