A predictive model for impact response of viscoelastic polymers in drop tests

Larson, Ronald G.; Goyal, Siddharth; Aloisio, C. J.

doi:10.1007/bf00366912

Cited by 9 publications

(7 citation statements)

References 7 publications

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“…For the drop-weight impact case, required data provided by Larson et al 10 are used as a case study for examining our theoretical formulation. A mass of 1.81 kg was dropped from a height of 42 cm on a cylindrical material of 2.49 cm diameter and 2.54 cm thickness.…”

Section: Resultsmentioning

confidence: 99%

“…Also, they found that the optimum viscoelastic material property of impact absorber depends on the shape of the impactor. Larson et al 10 developed a viscoelastic mathematical model that can predict the impact force and deflection of rubbery material with the help of the classical linear Hookean viscoelastic constitutive law. They performed the drop-weight test with a commercial drop tester to validate the model.…”

Section: Introductionmentioning

confidence: 99%

“…The cross-sectional dimensions, b = c = 150 mm and thickness h = 50 mm, are considered for viscoelastic material model. These values are plugged into equation(9) to get a numeric form of equation(10). After solving the Q(s), based on the types of roots, displacement is obtained from equations (11)-(13).In the first case, tan d values are varied, and the storage modulus of the material is adjusted to obtain 50% compression of its original thickness.…”

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confidence: 99%

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Mathematical modeling of viscoelastic material under impact load

Rabbi

Chalivendra

2019

The Journal of Strain Analysis for Engineering Design

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A linear physics-based model is developed to investigate the one-dimensional impact on a viscoelastic material. A generalized model with three Maxwell elements is considered to describe the viscoelastic behavior. An analytical method based on Laplace transformation is used to solve the impact problem. To have a comprehensive understanding of viscoelastic material response, drop-weight impact is also considered in this study. For both linear impact and drop-weight cases, a maximum reduction of 15% of the impact force as well as 32% higher energy absorption can be achieved with the increase in tan δ from 0.01 to 0.8 of viscoelastic material. In addition, for linear impact, impact force decreases by 20% when tan δ = 1. With the increase in tan δ, storage modulus decreases by around 57% for maintaining a predetermined deformation. Moreover, for almost constant maximum displacement, materials with a higher storage modulus absorb more impact energy and experience higher impact force as compared to materials with a lower storage modulus.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Mathematical modeling of viscoelastic material under impact load

Rabbi

Chalivendra

2019

The Journal of Strain Analysis for Engineering Design

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“…A more advance spring constant model is now investigated and results will be reported in a future publication. The skin biosimulant coupled with the soft tissue is more complex still, and its behavior is currently being investigated through finite element analysis, and relevant literature studies (Larson, et al, 1996) (Salisbury and Cronin, 2009). …”

Section: Test Resultsmentioning

confidence: 99%

Human-robot collaboration dynamic impact testing and calibration instrument for disposable robot safety artifacts

Dagalakis

Yoo

Oeste

2016

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The Dynamic Impact Testing and Calibration Instrument (DITCI) is a simple instrument with a significant data collection and analysis capability that is used for the testing and calibration of biosimulant human tissue artifacts. These artifacts may be used to measure the severity of injuries caused in the case of a robot impact with a human. In this paper we describe the DITCI adjustable impact and flexible foundation mechanism, which allows the selection of a variety of impact force levels and foundation stiffness. The instrument can accommodate arrays of a variety of sensors and impact tools, simulating both real manufacturing tools and the testing requirements of standards setting organizations. A computer data acquisition system may collect a variety of impact motion, force, and torque data, which are used to develop a variety of mathematical model representations of the artifacts. Finally, we describe the fabrication and testing of human abdomen soft tissue artifacts, used to display the magnitude of impact tissue deformation. Impact tests were performed at various maximum impact force and average pressure levels.

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“…2. This allows silly putty to bounce elastically since its τ term ∼ 0.1 s is longer than the typical timescales that correspond to impact, τ obs ∼ 0.1-10 ms. 63,64 The distinction between long and short timescales has important practical consequences for designing materials with desired properties for specific applications. Typically, τ obs is determined by the application of interest, and the goal is to control τ term to elicit the appropriate viscoelastic behavior.…”

Section: Box 4 Long and Short Timescalesmentioning

confidence: 99%