Characterization of Delamination in Laser Microtransfer Printing

2014 ◽  
Vol 2 (1) ◽  
Author(s):  
Ala'a M. Al-okaily ◽  
John A. Rogers ◽  
Placid M. Ferreira
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Laser Heating ◽  
Thermal Gradient ◽  
Heterogeneous Materials ◽  
Element Model ◽  
Extensive Study ◽  
Materials Integration ◽  
Gradient Fields

Microtransfer printing is rapidly emerging as an effective method for heterogeneous materials integration. Laser microtransfer printing (LMTP) is a noncontact variant of the process that uses laser heating to drive the release of the microstructure from the stamp. This makes the process independent of the properties or preparation of the receiving substrate. In this paper, an extensive study is conducted to investigate the capability of the LMTP process. Furthermore, a thermomechanical finite element model (FEM) is developed, using the experimentally observed delamination times and absorbed powers, to estimate the delamination temperatures at the interface, as well as the strain, displacement, and thermal gradient fields.

Design and characterization of a hybrid soft gripper with active palm pose control

2020 ◽  
Vol 39 (14) ◽  
pp. 1668-1685 ◽  
Author(s):  
Vignesh Subramaniam ◽  
Snehal Jain ◽  
Jai Agarwal ◽  
Pablo Valdivia y Alvarado
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Composite Structure ◽  
Element Model ◽  
Open Loop ◽  
Aspect Ratios ◽  
Maximum Payload ◽  
Wide Range ◽  
Pose Control

The design and characterization of a soft gripper with an active palm to control grasp postures is presented herein. The gripper structure is a hybrid of soft and stiff components to facilitate integration with traditional arm manipulators. Three fingers and a palm constitute the gripper, all of which are vacuum actuated. Internal wedges are used to tailor the deformation of a soft outer reinforced skin as vacuum collapses the composite structure. A computational finite-element model is proposed to predict finger kinematics. Thanks to its active palm, the gripper is capable of grasping a wide range of part geometries and compliances while achieving a maximum payload of 30 N. The gripper natural softness enables robust open-loop grasping even when components are not properly aligned. Furthermore, the grasp pose of objects with various aspect ratios and compliances can be robustly maintained during manipulation at linear accelerations of up to 15 m/s2 and angular accelerations of up to 5.23 rad/s2.

Finite element model for the characterization of deleterious phases by eddy current technique

2012 ◽  
Vol 39 (1-4) ◽  
pp. 305-310 ◽  
Author(s):  
Maria C.L. Areiza ◽  
Rodrigo Sacramento ◽  
Joao M.A Rebello ◽  
Rubem L. Sommer ◽  
Diego Gonzalez
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Eddy Current ◽  
Element Model ◽  
Current Technique

Characterization of articular cartilage by combining microscopic analysis with a fibril-reinforced finite-element model

2007 ◽  
Vol 40 (8) ◽  
pp. 1862-1870 ◽  
Author(s):  
Petro Julkunen ◽  
Panu Kiviranta ◽  
Wouter Wilson ◽  
Jukka S. Jurvelin ◽  
Rami K. Korhonen
Keyword(s):  
Finite Element ◽  
Articular Cartilage ◽  
Finite Element Model ◽  
Microscopic Analysis ◽  
Element Model

Characterization of the static behavior of micromirrors under the effect of capillary force, an analytical approach

2012 ◽  
Vol 226 (9) ◽  
pp. 2361-2372 ◽  
Author(s):  
Hamid Moeenfard ◽  
Ali Darvishian ◽  
Hassan Zohoor ◽  
Mohammad Taghi Ahmadian
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Perturbation Method ◽  
Capillary Force ◽  
Homotopy Perturbation Method ◽  
Element Model ◽  
Geometrical Parameters ◽  
Static Behavior ◽  
Homotopy Perturbation

In this article, the static behavior of micromirrors under the effect of capillary force is studied. The dimensionless equations governing the static behavior and the pull-in state of the micromirror under capillary force are obtained, and the effects of different geometrical parameters on the pull-in angle of micromirrors are investigated. The static behavior of micromirrors is studied both numerically and analytically using the homotopy perturbation method. It is observed that with increasing the instability number defined in this article, the rotation angle of the micromirror is increased and suddenly the pull-in occurs. The results of the presented model are then verified by comparing them with the results of finite element simulations performed in the commercial finite element model software ANSYS. The agreement between the results of finite element model and those of the proposed analytical model shows that homotopy perturbation method can be used as a fast and accurate tool for predicting mirror’s behavior under capillary force.

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