scholarly journals An experimental study of the bearing capacity of wall models with openings under one and two-way loading

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Barei Abdul ◽  
Victor Ledenev ◽  
Yaroslav Savinov ◽  
Yaya Keyta
Keyword(s):  
Bearing Capacity ◽  
Functional Dependencies ◽  
Stress Concentrations ◽  
Factors Affecting ◽  
Numerical Studies ◽  
Destruction Mechanism ◽  
Wall Models ◽  
Experimental Values ◽  
Stability Of Structures ◽  
Classical Calculation

The results of an experimental and numerical studies of the stress-strain state of wall models under one and two way action are presented. The mechanisms of destruction of walls with openings are described. The functional dependencies between the destructive loads of the onset of crack formation and the influencing parameters are obtained. It is shown that the openings are stress concentrators, leading to the occurrence of micro and macro damage, the appearance and development of cracks, and in some cases to the loss of stability of structures (walls). The obtained influence functions can be included in traditional calculation methods with the aim of clarifying them. The factors affecting the process of cracking and fracture are given. Their modeling will allow to predict and prevent adverse events. Practical methods for regulating stresses, forces, and displacements that reduce the influence of various concentrators are considered. The analysis of the destruction mechanism of wall models carried out in this article allows one to study the influence of the size, position, and shape of window openings on the bearing capacity of walls. For example, the presence of stress concentrations in the region of the corners of square openings and their absence in round ones. The system of indicators of the sentry type ICh-10 made it possible to control the deformation of models from the plane of the walls, which is especially important under conditions of lateral pinching. The experimental values of the strength of the walls with openings compared with the calculated ones, which made it possible to see the degree of simplification of the classical calculation models used in design practice.

Analysis of Stress Concentrations in Thick Cylinders With Sideholes and Crossholes

1972 ◽  
Vol 94 (3) ◽  
pp. 815-824 ◽  
Author(s):  
J. C. Gerdeen
Keyword(s):  
Stress Concentration ◽  
Stress Concentrations ◽  
Concentration Factors ◽  
Stress Concentration Factors ◽  
Experimental Values ◽  
Pressure Stress ◽  
Shrink Fit ◽  
Outside Diameter ◽  
Theoretical Results

An approximate theoretical analysis is presented for the determination of stress concentration factors in thick walled cylinders with sideholes and crossholes. The cylinders are subjected to both internal pressure and external shrink-fit pressure. Stress concentration factors are plotted as functions of the geometrical ratios of outside diameter-to-bore diameter, and bore diameter-to-sidehole diameter. Theoretical results are compared to experimental values available in the literature and results of experiments described in a separate paper.

Problems of Cold-Bent Notched C-Shaped Profile Members

2014 ◽  
Vol 941-944 ◽  
pp. 1871-1875 ◽  
Author(s):  
Nikolay I. Vatin ◽  
Tatiana Nazmeeva ◽  
Roman Guslinscky
Keyword(s):  
Bearing Capacity ◽  
Cross Sections ◽  
Experimental Investigations ◽  
Heat Current ◽  
Thermal Profile ◽  
Engineering Structures ◽  
Normative Documents ◽  
Steel Members ◽  
Global Buckling ◽  
Stability Of Structures

Nowadays cold bent steel thermal сold-bent С-profile is widely used in building construction but we still have some little studied questions in the fields of thermal conductivity, air permeability, resistibility and corrosion behavior of the profile. Cold-bent notched С-profile is used for interior exterior panel members. Lengthwise notches made chequerwise in the profile walls increase the distance of heat flow and decrease heat conductivity and eliminate cold bridges that is why the profile is called “thermal profile”. Cold-bent profile made by cold bending requires alternate approach when engineering structures are designed and maintained. The approach means thin walls’ and the profile special form’ impact on the bearing capacity and stability of the structures should be taken into account. In spite of the wide use of cold-bent notched C-profile in building frameworks, we see lack of information on how the notches influence the bearing capacity and stability of structures. There are no official normative documents on calculation and designing of cold-bent notched profile structures. We carry out theoretical and experimental investigations on global buckling and bearing capacity of steel members of C-shaped notched profiles of different cross-sections area. We carry out theoretical and experimental investigations on heat current passing through the thermal profile structure is held with the use of testing bed.

scholarly journals From non-local Eringen’s model to fractional elasticity

2018 ◽  
Vol 24 (6) ◽  
pp. 1935-1953 ◽  
Author(s):  
Anton Evgrafov ◽  
José C. Bellido
Keyword(s):  
Riesz Potential ◽  
Heterogeneous Material ◽  
Research Literature ◽  
Stress Concentrations ◽  
Uniqueness Of Solutions ◽  
Numerical Studies ◽  
Smooth Kernels ◽  
Ill Posed ◽  
Non Local ◽  
Dimension One

Eringen’s model is one of the most popular theories in non-local elasticity. It has been applied to many practical situations with the objective of removing anomalous stress concentrations around geometric shape singularities, which appear when local modelling is used. Despite the great popularity of Eringen’s model within the mechanical engineering community, even the most basic questions such as the existence and uniqueness of solutions have been rarely considered in research literature for this model. In this work we focus on precisely these questions, proving that the model is in general ill-posed in the case of smooth kernels, the case which appears rather often in numerical studies. We also consider the case of singular, non-smooth kernels and for the paradigmatic case of Riesz potential we establish the well-posedness of the model in fractional Sobolev spaces. For such a kernel, in dimension one the model reduces to the well-known fractional Laplacian. Finally, we discuss possible extensions of Eringen’s model to spatially heterogeneous material distributions.

scholarly journals Behavior of the T-Shaped Concrete-Filled Steel Tubular Columns after Elevated Temperature

2021 ◽  
Vol 2021 ◽  
pp. 1-20
Author(s):  
Xianglong Liu ◽  
Jicheng Zhang ◽  
Hailin Lu ◽  
Ning Guan ◽  
Jiahao Xiao ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Bearing Capacity ◽  
Failure Modes ◽  
Shear Failure ◽  
Element Model ◽  
Ultimate Bearing Capacity ◽  
Steel Tubes ◽  
Tubular Columns ◽  
Short Columns ◽  
Experimental Values

The mechanical properties of T-shaped concrete-filled steel tubular (TCFST) short columns under axial compression after elevated temperature are investigated in this paper. A total of 30 TCFST short columns with different temperature (T), steel ratio (α), and duration of heating (t) were tested. The TCFST column was directly fabricated by welding two rectangular steel tubes together. The study mainly investigated the failure modes, the ultimate bearing capacity, the load-displacement, and the load-strain performance of the TCFST short columns. Experimental results indicate that the rectangular steel tubes of the TCFST column have deformation consistency, and the failure mode consists of local crack, drum damage, and shear failure. Additionally, the influence of high temperature on the residual bearing capacity of the TCFST is significant, e.g., a higher temperature can downgrade the ultimate bearing capacity. Finally, a finite element model (FEM) is developed to simulate the performance of the TCFST short columns under elevated temperature, and the results agree with experimental values well. Overall, this investigation can provide some guidance for future studies on damage assessment and reinforcement of the TCFST columns.

scholarly journals Role of mechanical cues and hypoxia on the growth of tumor cells in strong and weak confinement: A dual in vitro–in silico approach

2020 ◽  
Vol 6 (13) ◽  
pp. eaaz7130 ◽  
Author(s):  
V. Le Maout ◽  
K. Alessandri ◽  
B. Gurchenkov ◽  
H. Bertin ◽  
P. Nassoy ◽  
...  
Keyword(s):  
In Silico ◽  
Time Course ◽  
Growth Dynamics ◽  
Tumor Model ◽  
Mechanistic Modeling ◽  
Physical Factors ◽  
Factors Affecting ◽  
Numerical Studies

Characterization of tumor growth dynamics is of major importance for cancer understanding. By contrast with phenomenological approaches, mechanistic modeling can facilitate disclosing underlying tumor mechanisms and lead to identification of physical factors affecting proliferation and invasive behavior. Current mathematical models are often formulated at the tissue or organ scale with the scope of a direct clinical usefulness. Consequently, these approaches remain empirical and do not allow gaining insight into the tumor properties at the scale of small cell aggregates. Here, experimental and numerical studies of the dynamics of tumor aggregates are performed to propose a physics-based mathematical model as a general framework to investigate tumor microenvironment. The quantitative data extracted from the cellular capsule technology microfluidic experiments allow a thorough quantitative comparison with in silico experiments. This dual approach demonstrates the relative impact of oxygen and external mechanical forces during the time course of tumor model progression.

Stability Analysis of Plate-Cone Reticulated Shell

2011 ◽  
Vol 71-78 ◽  
pp. 3760-3763
Author(s):  
Xing Wang
Keyword(s):  
Stability Analysis ◽  
Bearing Capacity ◽  
Double Layer ◽  
Geometrical Nonlinearity ◽  
Ultimate Bearing Capacity ◽  
Arc Length ◽  
Stability Behavior ◽  
Destruction Mechanism ◽  
The Stability ◽  
Complete Process

This paper carries out stability analysis on plate-cone reticulated shell considering geometrical nonlinearity of cooperating work between plates and members. In this paper, stability behavior of different kinds of plate-cone reticulated shell considering geometrical nonlinearity is analyzed by using the software ANSYS, tracking complete process balance path for load-displacement by using arc-length method, the several problems of plate-cone reticulated shell are studied, such as destruction mechanism, structural ductility, ultimate bearing capacity and strength reserve, some important conclusions are obtained. After analyzing the stability behavior of double-layer reticulated shell by ANSYS and comparing with plate-cone reticulated shell, it is proved that plate-cone reticulated shell is more advantageous than double-layer reticulated shell in the aspect of stability behavior.

Numerical studies of the influence of textural gradients on the local stress concentrations around fibers in carbon/carbon composites

2008 ◽  
Vol 24 (12) ◽  
pp. 2194-2205 ◽  
Author(s):  
Romana Piat ◽  
Igor Tsukrov ◽  
Thomas Böhlke ◽  
Norbert Bronzel ◽  
Tilottama Shrinivasa ◽  
...  
Keyword(s):  
Local Stress ◽  
Carbon Composites ◽  
Stress Concentrations ◽  
Numerical Studies

SLIP FLOW IN LONG, SINGLE CAPILLARIES: PART II. STEADY-STATE FLOW AND SPECULAR REFLECTION

1965 ◽  
Vol 43 (4) ◽  
pp. 896-912 ◽  
Author(s):  
R. M. Barrer ◽  
D. Nicholson
Keyword(s):  
Steady State ◽  
Specular Reflection ◽  
Slip Flow ◽  
Rare Gases ◽  
Permeability Ratio ◽  
Factors Affecting ◽  
Glass Capillaries ◽  
Different Temperatures ◽  
Linear Plot ◽  
Experimental Values

The steady-state slip flow of the rare gases (He, Ne, Ar, Kr, and Xe) and of propane, CO2, and SO2 has been studied at different temperatures in long, single glass capillaries. The results give values of viscosity which are in agreement with literature values when Ar is used as a calibrating gas. The results can be expressed as a linear plot of the non-dimensional permeability ratio K/K0 against reciprocal Knudsen number; the intercept on the K/K0 axis is a. The value of this intercept depends on both gas and temperature being higher for light gases and high temperatures than for more condensable gases and low temperatures. The parameter a is therefore replaced by ((2 – β)/β)a1 where (1 – β) is the so-called specular reflection coefficient and a1 is a constant. The factors affecting (1 – β) have been discussed. It is suggested that contributions to (1 – β) will arise both from elastically and from inelastically scattered molecules, and the magnitude of these contributions is assessed in terms of the properties of the gas and the surface. The expression finally obtained is compared with experimental values of (1 – β).

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