The Experts below are selected from a list of 108 Experts worldwide ranked by ideXlab platform
Andrey R. Da Silva - One of the best experts on this subject based on the ideXlab platform.
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Experimental evaluation of sound insulation of light steel frame façades that use horizontal inter-stud stiffeners and different lining materials
Building and Environment, 2015Co-Authors: Stephan Paul, Graziella Ferrer Radavelli, Andrey R. Da SilvaAbstract:Abstract Sound insulation of light steel frame (LSF) and wood stud double walls is being studied for several decades. However, some specific cases that include the presence of horizontal stiffeners or the use of specific linings, such as cement boards for the outer lining, instead of materials like OSB-resin panels or vinyl siding, are rarely investigated. Thus ten different LSF walls, using sheatings made from OSB panels, cement boards, plasterboards, Smartside OSB-resin panels, PVC panels and polymer mortar covered XPS panels, and having additional horizontal stiffeners between the LSF studs, were mounted in a sound transmission measurement facility and measurements were carried out in accordance with the ISO 10140:2010 package. Sound insulation was characterized by means of the sound reduction index R , the weighted sound reduction index R w , spectral adaptation terms C ; C tr and sound transmission class. The influence of resilient channels and Foam Tape, placed between panels and the metallic studs, was also evaluated. Weighted sound reduction indices R w ranged from 43 dB to 47 dB, being the smallest for a wall that uses PVC cladding and the largest for the wall that uses cement board sheating. The addition of resilient channels and Foam Tape provides an increase of up to 5 dB in R w and STC. The slight increase in sound insulation above the modified mass-air-mass resonance provided by the resilient channels, leveling off at max 10 dB, was predicted correctly by a simple and generic model for the modified mass-air-mass resonance from the literature.
James P. Malone - One of the best experts on this subject based on the ideXlab platform.
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An Anatomic Model for Use in Surgical Skills Training of Tracheotomy
Otolaryngology-Head and Neck Surgery, 2011Co-Authors: Amy Ingram, Jennifer A. Bartlett, James P. MaloneAbstract:Objective: The objective would be to design a low cost, reproducible anatomic model to simulate tracheotomy in the surgical skills training laboratory. The model was adapted from a base model used previously for verification of proficiency (VOP) assessment of cricothyrotomy by general surgery residents.Method: The following materials were used: ventilator tubing, vessel loops, a 2x4x9-inch block of wood, red and white felt fabric, automotive ceiling headliner, cardboard, Foam Tape, adhesive spray, and Foam. All materials were found easily at a local craft store or in medical discard.Results: The model was assembled by securing ventilator tubing to a block of wood to represent the trachea. Thyroid and cricoid cartilages were fashioned and secured to ensure palpable landmarks. An anterior section of ventilator tubing was removed and replaced with Foam Tape to allow for a recyclable base. Finally, the thyroid and superficial tissue (including vessels and strap muscles) were assembled using headliner, felt, a...
David R. Gagnon - One of the best experts on this subject based on the ideXlab platform.
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Developing a Simple Damage Model for the Long-Term Durability of Acrylic Foam Structural Glazing Tape Subject to Sustained Wind Loading
Journal of Architectural Engineering, 2012Co-Authors: Benjamin W. Townsend, Donatus C. Ohanehi, David A. Dillard, Steven R. Austin, Fay Salmon, David R. GagnonAbstract:AbstractThis article presents a simple linear damage accumulation model that may have applicability for predicting damage from sustained winds in double-sided acrylic Foam Tape used to attach curtain wall glazing panels to buildings. The purpose of this model is to investigate the possible cumulative effects of years of wind-induced stresses that are less than the peak stress expected during a 3-s gust, as specified in current design guidelines established by the structural glazing industry and adopted by the manufacturer of these structural glazing Tapes. Several representative wind histories are selected to provide input data for the model. These wind histories provide multiple years of average wind speeds over either 10-min or 1-h recording intervals, depending on the source. Each entry in a wind speed history is converted to stress on the glazing adhesive Tape on assumed window dimensions using the standard wind loading design equations of ASCE 7-05. A creep rupture prediction equation, developed from...
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Evaluating the Performance and Durability of Acrylic Foam Tapes for Structural Glazing Applications
2010Co-Authors: Benjamin W. Townsend, Donatus C. Ohanehi, David A. Dillard, Steven R. Austin, Fay Salmon, David R. GagnonAbstract:This article presents a simple linear damage accumulation model that may have applicability for predicting damage from sustained winds in double-sided acrylic Foam Tape used to attach curtain wall glazing panels to buildings. The goal is to investigate the possible cumulative effects of years of wind-induced stresses that are typically lower than the peak stress expected during a three-second gust, as specified in current design guidelines established by the structural glazing industry and adopted by the manufacturer of these structural glazing Tapes. Using the wind speed histories employed here, the results from this linear damage accumulation model indicate that the sustained non-peak stresses do not induce more damage than the peak stresses, and therefore do not provide clear evidence that the industry-established procedure of peak-stress design is inadequate when applied to 3M VHB™ G23F acrylic Foam Tape bond. The results do suggest, however, that the accumulation of damage from sustained wind speeds, especially winds from storm events, could present a mode of failure that merits examination along with the more traditional peak wind speed design procedure currently in use by the structural glazing industry and employed by the vendor. This approach may have applications for other time-dependent glazing sealants as well.
David A. Dillard - One of the best experts on this subject based on the ideXlab platform.
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Developing a Simple Damage Model for the Long-Term Durability of Acrylic Foam Structural Glazing Tape Subject to Sustained Wind Loading
Journal of Architectural Engineering, 2012Co-Authors: Benjamin W. Townsend, Donatus C. Ohanehi, David A. Dillard, Steven R. Austin, Fay Salmon, David R. GagnonAbstract:AbstractThis article presents a simple linear damage accumulation model that may have applicability for predicting damage from sustained winds in double-sided acrylic Foam Tape used to attach curtain wall glazing panels to buildings. The purpose of this model is to investigate the possible cumulative effects of years of wind-induced stresses that are less than the peak stress expected during a 3-s gust, as specified in current design guidelines established by the structural glazing industry and adopted by the manufacturer of these structural glazing Tapes. Several representative wind histories are selected to provide input data for the model. These wind histories provide multiple years of average wind speeds over either 10-min or 1-h recording intervals, depending on the source. Each entry in a wind speed history is converted to stress on the glazing adhesive Tape on assumed window dimensions using the standard wind loading design equations of ASCE 7-05. A creep rupture prediction equation, developed from...
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Evaluating the Performance and Durability of Acrylic Foam Tapes for Structural Glazing Applications
2010Co-Authors: Benjamin W. Townsend, Donatus C. Ohanehi, David A. Dillard, Steven R. Austin, Fay Salmon, David R. GagnonAbstract:This article presents a simple linear damage accumulation model that may have applicability for predicting damage from sustained winds in double-sided acrylic Foam Tape used to attach curtain wall glazing panels to buildings. The goal is to investigate the possible cumulative effects of years of wind-induced stresses that are typically lower than the peak stress expected during a three-second gust, as specified in current design guidelines established by the structural glazing industry and adopted by the manufacturer of these structural glazing Tapes. Using the wind speed histories employed here, the results from this linear damage accumulation model indicate that the sustained non-peak stresses do not induce more damage than the peak stresses, and therefore do not provide clear evidence that the industry-established procedure of peak-stress design is inadequate when applied to 3M VHB™ G23F acrylic Foam Tape bond. The results do suggest, however, that the accumulation of damage from sustained wind speeds, especially winds from storm events, could present a mode of failure that merits examination along with the more traditional peak wind speed design procedure currently in use by the structural glazing industry and employed by the vendor. This approach may have applications for other time-dependent glazing sealants as well.
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Tests of Adhesives to Augment Nails in Wind Uplift Resistance of Roofs
Journal of Structural Engineering, 2009Co-Authors: Matthew A. Turner, David A. Dillard, Raymond H. Plaut, Joseph R. Loferski, Rick CaudillAbstract:The addition of adhesives to resist uplift wind forces at the roof framing-to-sheathing connection was tested. Two specimen configurations were used to compare the tensile resistance of typical nail connections to that of connections that also included acrylic Foam Tape or construction adhesive. A set of small specimens had a single nail connecting the sheathing to the framing, and a set of larger specimens had three nails. Connections were tested using monotonic deflection rates and a cyclic loading protocol that was a modified version of the CUREE protocol. Specimens were tested at several monotonic deflection rates. In general, the faster deflection rates increased the connection capacity. The results demonstrated that the specimens constructed with the addition of adhesives provided an improvement over the ones with only a nail. The addition of construction adhesive resulted in the highest resistances for monotonic tests, whereas the addition of adhesive Tape provided the most strength in the cyclic tests.
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Experiments and inelastic analysis of the loop tack test for pressure-sensitive adhesives
The Journal of Adhesion, 2004Co-Authors: Youngjin Woo, David A. Dillard, Raymond H. Plaut, Stacy L. CoulthardAbstract:The loop tack test is studied experimentally and numerically using a model system. The ends of a steel strip are clamped together, giving a teardrop shape, and the loop is pushed downward onto an acrylic Foam Tape and then pulled upward off the Tape. In the finite element analysis, the strip is represented by beam elements and a bilinear elastic–plastic constitutive law. The traction–separation relationship for the pressure-sensitive adhesive (PSA) is modeled with a trapezoidal cohesive zone. Viscoelastic behavior of the PSA is included in one case. Curves of the pulling force versus the top displacement (i.e., tack curves) exhibit a sharp peak just before separation of the loop from the strip. The effects of the PSA parameters, contact length, loop length and thickness, and loading rate are investigated. The numerical results compare more favorably with the experimental results than do those from a previous elastic analysis.
Ta-lun Chen - One of the best experts on this subject based on the ideXlab platform.
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Optimal Design of a Motor-Driven Three-Finger Soft Robotic Gripper
IEEE ASME Transactions on Mechatronics, 2020Co-Authors: Fu-ming Chung, Yang Chen, Chen-hua Chiu, Ta-lun ChenAbstract:This article presents an innovative, motor-driven, three-finger compliant gripper for adaptive grasping of size-varied delicate objects. An optimized compliant finger design is identified numerically through a topology optimization method. A stepper motor is used to actuate three identical compliant fingers, which can operate through elastic bending deformation. Finite-element models are developed to investigate the maximum equivalent stress, input force, and output displacement relations corresponding to the amount of input displacement of the compliant finger. Simulation results show that the proposed finger design is with a lower driving force and a lower maximum equivalent stress during operation comparing to one previous design. The proposed compliant finger is prototyped by three-dimensional printing using thermoplastic elastomer. Experimental results for the input displacement versus input force and input displacement versus geometric advantage relationships of the prototyped finger agree well with simulation results. The developed three-finger soft robotic gripper is mounted on an industrial robot arm to demonstrate its capability in handing size-varied delicate objects, such as egg, fruits, and glass products. Experimental results show that the proposed three-finger gripper can be used to grip object with a maximum weight of 4.2 kg and a maximum object size of 140 mm. The overall weight of the developed three-finger soft robotic gripper is 1.2 kg. The load capacity of the developed gripper can vary according to the friction between gripper and object. The maximum payload of the gripper can be increased to 9.5 kg when an additional antislip Foam Tape is applied on the grip surfaces of the compliant fingers.