Needham, MA, United States
Needham, MA, United States

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Chakrabarti-Bell S.,General Mills Technology | Bergstrom J.S.,Veryst Engineering LLC | Lindskog E.,General Mills Technology | Sridhar T.,Monash University
Journal of Food Engineering | Year: 2010

Controlling the dough sheeting processes has been a long standing challenge in the food industry. This paper presents the results of a study aimed at developing a validated finite element model for simulating dough sheeting processes. An instrumented, two-roll dough sheeter was constructed to measure roll forces and dough thickness during sheeting. To develop a rheological model, true rheological properties of dough were measured in compression and extension. A filament stretching device was constructed to obtain consistent data for dough extension. Results showed dough to be a non-linear, rate-dependent material that was capable of undergoing large deformations with only moderate elastic recovery. Freshly mixed dough had additional complexities of anisotropy and Mullins softening. The Bergstrom-Boyce model, which has been known to capture large deformation behaviors of lightly cross-linked elastomers, was modified to include anisotropy and Mullins softening and applied to dough. The sheeting process was modeled in finite element simulations as a plane-strain rolling operation using the commercially available software, Abaqus. The simulation predictions were in good agreement with experimental data for both roll forces and dough thickness. Techniques for controlling dough flow rates utilizing on-line, roll force measurements have been projected. Future studies for delineating sheeting effects on dough structure have been identified. © 2010 Elsevier Ltd. All rights reserved.


Hurtado J.A.,DS SIMULIA Corporation | Lapczyk I.,DS SIMULIA Corporation | Govindarajan S.M.,Veryst Engineering LLC
Constitutive Models for Rubber VIII - Proceedings of the 8th European Conference on Constitutive Models for Rubbers, ECCMR 2013 | Year: 2013

We present a finite-strain constitutive framework, the Parallel Rheological Framework (Lapczyk, Hurtado and Govindarajan, 2012), to model non-linear viscoelasticity, Mullins effect and permanent set in elastomers. The framework is based on the superposition of finite-strain viscoelastic and elastoplastic networks in parallel, so that the overall stress response is additive. For each network the model assumes a multiplicative split of the deformation gradient into an elastic component and a viscous or plastic component, depending on whether the network is viscoelastic or elastoplastic, respectively. Stress softening is modeled using a modified version of Ogden and Roxbourgh's (1999) pseudo-elasticity theory. Plasticity in the plastic network is modeled in the context of finite strains using a Mises yield condition, and an associated flow rule. The viscous response in the viscoelastic networks is obtained from a flow rule which can be a function of the stress invariants and internal variables, and different evolution laws for the internal variables are allowed within the framework of the model. This Parallel Rheological Framework has been implemented in the commercial finite element software Abaqus and has been used successfully to predict the mechanical behavior of filled rubbers and polymers. Examples of numerical simulations using this framework are presented. © 2013 Taylor & Francis Group.


Bergstrom J.S.,Veryst Engineering LLC | Hayman D.,Veryst Engineering LLC
Annals of Biomedical Engineering | Year: 2015

This article provides an overview of the connection between the microstructural state and the mechanical response of various bioresorbable polylactide (PLA) devices for medical applications. PLLA is currently the most commonly used material for bioresorbable stents and sutures, and its use is increasing in many other medical applications. The non-linear mechanical response of PLLA, due in part to its low glass transition temperature (Tg ≈ 60 °C), is highly sensitive to the molecular weight and molecular orientation field, the degree of crystallinity, and the physical aging time. These microstructural parameters can be tailored for specific applications using different resin formulations and processing conditions. The stress–strain, deformation, and degradation response of a bioresorbable medical device is also strongly dependent on the time history of applied loads and boundary conditions. All of these factors can be incorporated into a suitable constitutive model that captures the multiple physics that are involved in the device response. Currently developed constitutive models already provide powerful computations simulation tools, and more progress in this area is expected to occur in the coming years. © 2015 Biomedical Engineering Society


Trademark
Veryst Engineering LLC | Date: 2014-09-18

Electrotechnical and electronic devices for harvesting mechanical energy, energy conversion, and energy generation, namely, electrical power supplies for sensors and electric actuators for pollutants, heat, motion, location detection, communication, pressure and electricity; electric vibration sensors for applications such as monitoring equipment and environmental conditions, vibration meters, radio receivers, radio transmitters, piezo electric sensors, piezo electric actuators, and optical transmitters; weighing, signaling, measuring, counting, recording, monitoring, testing, and open- and closed-loop control and switching devices, namely, radio-controlled electric switches, electric sensors and electric actuators for pollutants, location detection, communication, heat, motion, pressure and electricity. Engineering consulting services in the field of mechanical energy harvesting; engineering consulting services concerning systems for transforming wind, water and human motion into energy; product research, design and development services in connection with devices for mechanical energy harvesting.


Trademark
Veryst Engineering LLC | Date: 2014-09-18

Electrotechnical and electronic devices for harvesting mechanical energy, energy conversion, and energy generation, namely, electrical power supplies for sensors and electric actuators for pollutants, heat, motion, location detection, communication, pressure and electricity; electric vibration sensors for applications such as monitoring equipment and environmental conditions, vibration meters, radio receivers, radio transmitters, piezo electric sensors, piezo electric actuators, and optical transmitters; weighing, signaling, measuring, counting, recording, monitoring, testing, and open- and closed-loop control and switching devices, namely, radio-controlled electric switches, electric sensors and electric actuators for pollutants, location detection, communication, heat, motion, pressure and electricity. Engineering consulting services in the field of mechanical energy harvesting; engineering consulting services concerning systems for transforming wind, water and human motion into energy; product research, design and development services in connection with devices for mechanical energy harvesting.


Trademark
Veryst Engineering LLC | Date: 2010-07-22

Electrotechnical and electronic devices for harvesting mechanical energy, energy conversion, and energy generation, namely, power sources for sensors and actuators for pollutants, heat, motion, location detection, communication, pressure and electricity, vibration sensors, vibration meters, radio receivers, radio transmitters, piezo electric sensors, piezo electric actuators, and optical transmitters; weighing, signaling, measuring, counting, recording, monitoring, testing, and open- and closed-loop control and switching devices, namely, radio-controlled switches, electric sensors and electric actuators for pollutants, location detection, communication, heat, motion, pressure and electricity. Engineering consulting services in the field of mechanical energy harvesting; engineering consulting services concerning systems for transforming wind, water and human motion into energy; product research, design and development services in connection with devices for mechanical energy harvesting.


Trademark
Veryst Engineering LLC | Date: 2010-07-22

Electrotechnical and electronic devices for harvesting mechanical energy, energy conversion, and energy generation, namely, power sources for sensors and actuators for pollutants, heat, motion, location detection, communication, pressure and electricity, vibration sensors, vibration meters, radio receivers, radio transmitters, piezo electric sensors, piezo electric actuators, and optical transmitters; weighing, signaling, measuring, counting, recording, monitoring, testing, and open- and closed-loop control and switching devices, namely, radio-controlled switches, electric sensors and electric actuators for pollutants, location detection, communication, heat, motion, pressure and electricity. Engineering consulting services in the field of mechanical energy harvesting; engineering consulting services concerning systems for transforming wind, water and human motion into energy; product research, design and development services in connection with devices for mechanical energy harvesting.


Trademark
Veryst Engineering LLC | Date: 2013-01-01

Computer software, namely, computer software programs and modules for finite element analysis, simulation and modeling; computer software programs and modules for applying finite element analysis data and for reviewing results and creating reports from same; computer software programs and modules for material modeling and model calibration in the field of polymers and polymeric materials; computer software programs and modules consisting of a library of material model subroutines for use in connection with thermoplastics, thermosets, elastomers, and foams.


Trademark
Veryst Engineering LLC | Date: 2011-05-06

Electrotechnical and electronic devices for harvesting mechanical energy, energy conversion, and energy generation, namely, power sources for sensors and actuators for pollutants, heat, motion, location detection, communication, pressure and electricity, vibration sensors, vibration meters, radio receivers, radio transmitters, piezo electric sensors, piezo electric actuators, and optical transmitters; weighing, signaling, measuring, counting, recording, monitoring, testing, and open- and closed-loop control and switching devices, namely, radio-controlled switches, electric sensors and electric actuators for pollutants, location detection, communication, heat, motion, pressure and electricity. Engineering consulting services in the field of mechanical energy harvesting; engineering consulting services concerning systems for transforming wind, water and human motion into energy; product research, design and development services in connection with devices for mechanical energy harvesting.


Trademark
Veryst Engineering LLC | Date: 2013-09-17

Computer software, namely, computer software programs and modules for use in connection with creating and calibrating material models; computer software programs and modules for material modeling and model calibration.

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