Feature Quantification of Material Texture Perception Using a Force-Displacement Relationship *

A tongue pressure unit for measurement of lingual strength and patterns of tongue pressure is described. It consists of a force displacement transducer, a single channel, direct writing recording system, and a specially designed tongue pressure disk, head stabilizer, and pressure unit holder. Calibration with known weights indicated an essentially linear and consistent response. An evaluation of subject reliability in which 17 young adults were tested on two occasions revealed no significant difference in maximum pressure exerted during the two test trials. Suggestions for clinical and research use of the instrumentation are noted.

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Numerical Experiments with a Linear Force-Displacement Tooth Model

Journal of Dental Research ◽

10.1177/00220345690480012101 ◽

1969 ◽

Vol 48 (1) ◽

pp. 32-37 ◽

Cited By ~ 8

Author(s):

Han K. Huang ◽

Robert S. Ledley

Keyword(s):

Numerical Experiments ◽

Linear Force ◽

Force Displacement

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Study on improvement of prefolded energy absorption device to constant resistance and its mechanical properties

Science Progress ◽

10.1177/00368504211036820 ◽

2021 ◽

Vol 104 (3) ◽

pp. 003685042110368

Author(s):

Dong An ◽

Jiaqi Song ◽

Hailiang Xu ◽

Jingzong Zhang ◽

Yimin Song ◽

...

Keyword(s):

Mechanical Properties ◽

Energy Absorption ◽

Compression Test ◽

Side Wall ◽

Concave Side ◽

Displacement Curve ◽

Static Compression ◽

Constant Resistance ◽

The Impact ◽

Force Displacement

When the rock burst occurs, energy absorption support is an important method to solve the impact failure. To achieve constant resistance performance of energy absorption device, as an important component of the support, the mechanical properties of one kind of prefolded tube is analyzed by quasi-static compression test. The deformation process of compression test is simulated by ABAQUS and plastic strain nephogram of the numerical model are studied. It is found that the main factors affecting the fluctuation of force-displacement curve is the stiffness of concave side wall. The original tube is improved to constant resistance by changing the side wall. The friction coefficient affects the folding order and form of the energy absorbing device. Lifting the concave side wall stiffness can improve the overall stiffness of energy absorption device and slow down the falling section of force-displacement curve. It is always squeezed by adjacent convex side wall in the process of folding, with large plastic deformation. Compared with the original one, the improved prefolded tube designed in this paper can keep the maximum bearing capacity ( Pmax), increase the total energy absorption ( E), improve the specific energy absorption (SEA), and decrease the variance ( S2) of force-displacement curve.

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A process-based method for predicting lateral erosion rates

Natural Hazards ◽

10.1007/s11069-021-04587-y ◽

2021 ◽

Author(s):

Myron van Damme

Keyword(s):

Soil Mechanics ◽

High Surface ◽

Shear Stresses ◽

Empirical Equations ◽

Predictive Capability ◽

Surface Shear ◽

Erosion Rates ◽

Material Texture ◽

Empirical Coefficients ◽

The Impact

AbstractAn accurate means of predicting erosion rates is essential to improve the predictive capability of breach models. During breach growth, erosion rates are often determined with empirical equations. The predictive capability of empirical equations is governed by the range for which they have been validated and the accuracy with which empirical coefficients can be established. Most empirical equations thereby do not account for the impact of material texture, moisture content, and compaction energy on the erosion rates. The method presented in this paper acknowledges the impact of these parameters by accounting for the process of dilation during erosion. The paper shows how, given high surface shear stresses, the erosion rate can be quantified by applying the principles of soil mechanics. Key is thereby to identify that stress balance situation for which the dilatency induced inflow gives a maximum averaged shear resistance. The effectiveness of the model in predicting erosion rates is indicated by means of three validation test cases. A sensitivity analysis of the method is also provided to show that the predictions lie within the range of inaccuracy of the input parameters.

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A numerical study of the impact perforation of sandwich panels with graded hollow sphere cores

Advances in Mechanical Engineering ◽

10.1177/16878140211009415 ◽

2021 ◽

Vol 13 (4) ◽

pp. 168781402110094

Author(s):

Ibrahim Elnasri ◽

Han Zhao

Keyword(s):

Boundary Conditions ◽

Hollow Sphere ◽

Sandwich Panel ◽

Numerical Study ◽

Sandwich Panels ◽

Hopkinson Bar ◽

Core Density ◽

The Core ◽

The Impact ◽

Force Displacement

In this study, we numerically investigate the impact perforation of sandwich panels made of 0.8 mm 2024-T3 aluminum alloy skin sheets and graded polymeric hollow sphere cores with four different gradient profiles. A suitable numerical model was conducted using the LS-DYNA code, calibrated with an inverse perforation test, instrumented with a Hopkinson bar, and validated using experimental data from the literature. Moreover, the effects of quasi-static loading, landing rates, and boundary conditions on the perforation resistance of the studied graded core sandwich panels were discussed. The simulation results showed that the piercing force–displacement response of the graded core sandwich panels is affected by the core density gradient profiles. Besides, the energy absorption capability can be effectively enhanced by modifying the arrangement of the core layers with unclumping boundary conditions in the graded core sandwich panel, which is rather too hard to achieve with clumping boundary conditions.

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Interlayer Separation in Graphene Paper Comprising Electrochemically Exfoliated Graphene

Nanomaterials ◽

10.3390/nano11040865 ◽

2021 ◽

Vol 11 (4) ◽

pp. 865

Author(s):

Dang Du Nguyen ◽

TaeGyeong Lim ◽

Soomook Lim ◽

Ji Won Suk

Keyword(s):

Energy Storage Devices ◽

Storage Devices ◽

Fundamental Properties ◽

Exfoliated Graphene ◽

Graphene Flakes ◽

Fundamental Understanding ◽

Fracture Tests ◽

Graphene Paper ◽

Few Layer Graphene ◽

Force Displacement

The emergence of graphene paper comprising well-stacked graphene flakes has promoted the application of graphene-based materials in diverse fields such as energy storage devices, membrane desalination, and actuators. The fundamental properties of graphene paper such as mechanical, electrical, and thermal properties are critical to the design and fabrication of paper-based devices. In this study, the interlayer interactions in graphene paper were investigated by double cantilever beam (DCB) fracture tests. Graphene papers fabricated by flow-directed stacking of electrochemically exfoliated few-layer graphene flakes were mechanically separated into two parts, which generated force-displacement responses of the DCB sample. The analysis based on fracture mechanics revealed that the interlayer separation energy of the graphene paper was 9.83 ± 0.06 J/m2. The results provided a fundamental understanding of the interfacial properties of graphene papers, which will be useful for developing paper-based devices with mechanical integrity.

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A 3D-printed Haptic Material Library for Quantifying the Force-Displacement Relationship*

10.1109/whc49131.2021.9517178 ◽

2021 ◽

Author(s):

Masashi Nakatani ◽

Masataka Imura ◽

Yoichi Yamazaki ◽

Taisuke Okazaki ◽

Yoshihiro Asano ◽

...

Keyword(s):

3D Printed ◽

Material Library ◽

Force Displacement

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Feature Quantification of Material Softness Perception Using the Force-Displacement Relationship*

10.1109/whc49131.2021.9517179 ◽

2021 ◽

Author(s):

Masataka Imura ◽

Yoichi Yamazaki ◽

Masashi Nakatani ◽

Taisuke Okazaki ◽

Rino Uesaki ◽

...

Keyword(s):

Force Displacement

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Rocker outsole shoe is not a threat to postural stability in patients with diabetic neuropathy

Prosthetics and Orthotics International ◽

10.1177/0309364614543549 ◽

2014 ◽

Vol 40 (2) ◽

pp. 224-230 ◽

Cited By ~ 5

Author(s):

Banafshe Ghomian ◽

Mojtaba Kamyab ◽

Hassan Jafari ◽

Mohammadebrahim Khamseh ◽

Aoife Healy

Keyword(s):

Diabetic Neuropathy ◽

Response Latency ◽

Postural Stability ◽

Response Strength ◽

Diabetic Patients ◽

Foot Ulceration ◽

Objective Evidence ◽

Significant Difference ◽

Quasi Experimental ◽

Force Displacement

Background: Rocker outsole shoes are commonly prescribed to patients with diabetic neuropathy to offload a particular area of the foot sole, thereby decreasing the risk of foot ulceration. Contrary to this, some evidence has reported a postural destabilising effect of these shoes in healthy adults. Objective: To explore the postural stability of patients with diabetic neuropathy who wear a rocker outsole shoe. Study design: Quasi-experimental. Method: In total, 17 patients with diabetic neuropathy (aged 49.29 ± 7.48 years; 7 female, 10 males) participated in this study. A Motor Control Test measuring centre of force displacement, response strength scale and response latency in medium and large perturbations was conducted using the EquiTest system to evaluate postural stability while wearing a baseline shoe (without a rocker outsole) or a rocker outsole shoe (with a toe-only rocker sole). Results: No significant difference was observed between the shoe conditions in centre of force displacement and response latency of the participants (p > 0.05). The results indicated a significant increase in the response strength scale of participants by the rocker outsole, for medium forward and backward and large forward perturbations ( p = 0.014, p = 0.001 and p = 0.027, respectively). Conclusion: When the immediate effect is a concern, the rocker outsole shoe did not negatively affect postural stability in patients with diabetic neuropathy. Clinical relevance This article will provide objective evidence about the effect of rocker outsole on postural balance in diabetic patients. In prescription of rocker outsole to prevent plantar ulceration of diabetic foot, immediate postural destabilising is not a concern.

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