Parametric study on effects of load position on the stress distribution in network arch timber bridges with light timber decks on transverse crossbeams

2018 ◽  
Vol 163 ◽  
pp. 112-121 ◽  
Author(s):  
Anna Weronika Ostrycharczyk ◽  
Kjell Arne Malo
Keyword(s):  
Stress Distribution ◽  
Parametric Study ◽  
Timber Bridges

A Factorial Design Approach to Investigate the Effect of Geometry in Drill String Screw Connectors

1995 ◽  
Vol 117 (2) ◽  
pp. 101-107 ◽  
Author(s):  
H. Bahai ◽  
I. I. Esat ◽  
L. Rass
Keyword(s):  
Stress Concentration ◽  
Stress Distribution ◽  
Factorial Design ◽  
Stress Concentration Factor ◽  
Parametric Study ◽  
Design Method ◽  
Drill String ◽  
Parametric Equation ◽  
Efficient Calculation ◽  
Bending Modes

This paper describes a parametric study of drill string threaded connector design based on a “factorial design” method. The study is facilitated by a hybrid model which has been developed, validated, and reported previously, enabling efficient calculation of load and stress distribution along threaded connectors subjected to both axial and bending modes of loading. A parametric equation is produced where stress concentration factor is defined in terms of various geometrical variables. The equation is then utilized to carry out a constrained optimization within the feasible parameter space, and hence produce an “optimum” thread and connector design.

scholarly journals Finite Element Modeling of the Fiber-Matrix Interface in Polymer Composites

2020 ◽  
Vol 4 (2) ◽  
pp. 58 ◽  
Author(s):  
Daljeet K. Singh ◽  
Amol Vaidya ◽  
Vinoy Thomas ◽  
Merlin Theodore ◽  
Surbhi Kore ◽  
...  
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Polymer Composites ◽  
Parametric Study ◽  
Single Fiber ◽  
Interface Debonding ◽  
Matrix Interface ◽  
The Matrix ◽  
Fiber Matrix Interface ◽  
Fiber Matrix

Polymer composites are used in numerous industries due to their high specific strength and high specific stiffness. Composites have markedly different properties than both the reinforcement and the matrix. Of the several factors that govern the final properties of the composite, the interface is an important factor that influences the stress transfer between the fiber and matrix. The present study is an effort to characterize and model the fiber-matrix interface in polymer matrix composites. Finite element models were developed to study the interfacial behavior during pull-out of a single fiber in continuous fiber-reinforced polymer composites. A three-dimensional (3D) unit-cell cohesive damage model (CDM) for the fiber/matrix interface debonding was employed to investigate the effect of interface/sizing coverage on the fiber. Furthermore, a two-dimensional (2D) axisymmetric model was used to (a) analyze the sensitivity of interface stiffness, interface strength, friction coefficient, and fiber length via a parametric study; and (b) study the shear stress distribution across the fiber-interface-matrix zone. It was determined that the force required to debond a single fiber from the matrix is three times higher if there is adequate distribution of the sizing on the fiber. The parametric study indicated that cohesive strength was the most influential factor in debonding. Moreover, the stress distribution model showed the debonding mechanism of the interface. It was observed that the interface debonded first from the matrix and remained in contact with the fiber even when the fiber was completely pulled out.

A parametric study of the elastic stress distribution in pin-loaded tubes

1997 ◽  
Vol 32 (3) ◽  
pp. 213-228 ◽  
Author(s):  
R J Grant ◽  
J Smart
Keyword(s):  
Stress Distribution ◽  
Parametric Study ◽  
Elastic Stress ◽  
Numerical Study ◽  
Small Head ◽  
Stress Patterns

This paper describes a numerical study of the stress distribution in pin-loaded tubes. The effects of (a) the distance from the pin to the open end, (b) the variation in pin diameter, (c) the variation of tube thickness and (d) the variation in pin fit on the radial and circumferential stresses around the pin hole have been found and discussed. It is found that there are considerable differences between the stresses at the inner and outer surfaces of the tube which arise because the region around the pin and towards the open end of the tube ovalizes. This ovalization is more pronounced for a small head distance, a smaller diameter pin, a thinner tube and a clearance fit. The results for the pin-loaded tube are compared with those for a pin-loaded lug and it is shown that there are many similarities in the stress patterns.

Optimization of Inflated 32-panel Soccer Ball Membrane Models

2019 ◽  
Vol 60 (3) ◽  
pp. 201-209
Author(s):  
András Lengyel ◽  
Krisztián Hincz
Keyword(s):  
Stress Distribution ◽  
Internal Pressure ◽  
Mechanical Behaviour ◽  
Parametric Study ◽  
Model Parameters ◽  
Soccer Ball ◽  
Closed Surfaces ◽  
Thin Membranes ◽  
The Common ◽  
Membrane Models

This paper presents a study on the mechanical behaviour of thin membranes modelling the common 32-panel soccer balls. Most soccer balls are fabricated of synthetic flat panels subject to an internal pressure. Unlike most tensile structures such as tents, balls form closed surfaces, which are expected to comply strict conditions, most importantly regarding geometry. In this paper we perform a parametric study on a series of ball configurations, including a few commercially available ball types. The roundness and the stress distribution are numerically evaluated and compared in terms of the model parameters and the pressure.

A parametric study of the elastic stress distribution in pin-loaded lugs

1994 ◽  
Vol 29 (4) ◽  
pp. 299-307 ◽  
Author(s):  
R J Grant ◽  
J Smart ◽  
P Stanley
Keyword(s):  
Stress Distribution ◽  
Parametric Study ◽  
Applied Load ◽  
Elastic Stress ◽  
Numerical Study ◽  
Circumferential Stress ◽  
Hole Diameter ◽  
Interference Fit ◽  
Beneficial Effects

This paper describes a numerical study of the stress distribution in pin-loaded lugs. The effects of : (i) the ratio of lug width ( w) to hole diameter ( d), (ii) the ratio of the distance of the hole centre from the free end of the lug ( h) to hole diameter ( d), and (iii) the pin interference/clearance, on the magnitude and position of the maximum circumferential stress around the hole in the lug are established and discussed. Pin fit is shown to be a particularly important detail and the beneficial effects of an interference fit are shown to be considerable. It is also shown that for ratios w/d greater than 4 and h/d greater than 3 there is little variation in the maximum circumferential stress for a given applied load.

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