Questions tagged [solid-mechanics]

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Circling Morh's Circle (question on tensile stresses)

If I have a mechanical part subjected to a unkown torisional force with the specification that tensile stress should not exceed 150 MPA, how would I form the Morh's circle. I know that I have (150 ...
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29 views

Column Buckling Boundary Conditions — Welded Tubing Practical Application?

I'm trying to do some calculations for a personal project. I'm trying to understand column strength / buckling. My questions relate to Effective Length Constant, which is based on Boundary ...
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4answers
675 views

When calculating a force, why do I get different result when I try to calculate via torque vs via sum of forces at an axis?

If I just do it by writing that the sum on y axis is 0 I get $100+x=200$ $x=100$ If I try torque around the top: $x*800=200*500$ $x=125$ So what am I doing wrong?
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1answer
24 views

Are there ways to measure modulus of elasticity with an experimental apparatus?

It seems that measuring the modulus of elasticity of a material always involves the strength of materials or linear elasticity approach, where they make some experimental measurements for variables ...
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23 views

How to calculate compressive yield strength of a composite material or a fgm?

I know the volume fractions of HAP and titanium in a functionally graded material. How can I find yield strength of it?
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14 views

How is the slip calculated in Abaqus small-sliding interaction?

I’m doing research on the sliding of 2 fracture surfaces. To do that, I’m trying to understand the Small-sliding deformable interaction in the Abaqus (2018), and I use the Node-to-surface ...
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3answers
141 views

Moments of Fixed-Fixed Beam

I have a quick question related to the topic of mechanics of materials. If I were to have a beam that is fixed at both ends and has a central point force, do moments develop at the fixed supports? e....
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10 views

Viscoplastic model of solder alloys

I have found some data of viscoplastic Anand model for the SAC305 solder joint of electronic devices in the literature. Does this data depend on the thickness, length and width of the joint? I mean ...
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3answers
93 views

Truss Analysis Problem

In this case, L, theta and P are given, there will be 4 reactions at the wall? (2 horizontal and 2 vertical). $$\begin{align} \sum F_v &= 0 \therefore F_{v,B} + F_{v,A} = P \\ \sum F_h &= 0 \...
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22 views

Plastic Multiplier for Perfectly Plastic Materials

I'm trying to apply the associated flow rule to elastic-perfectly plastic material, i.e.,$$d\epsilon_{ij}^p=\lambda\dfrac{\partial f}{\partial \sigma_{ij}}$$, where $f$ is a yield function with no ...
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2answers
84 views

Buckling in Columns

The following images are taken from Mechanics of Materials, Ferdinard Beer et al. 6th ed (2012) Just wondering that why the effective length of the column is taken 0.7 L (highlighted in the sample ...
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2answers
55 views

Engineering stress and true stress

I'm confused as to what is the difference between the above said stresses and their corresponding strains. If possible can anybody explain in detail what is engineering stress
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3answers
85 views

Why does concentrated shear force on a beam influence the whole beam?

This might be a silly question but can someone explain how this shear force on the right side of the beam causes Qy throught the whole beam? I understand it mathematically but not conceptually so I ...
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1answer
107 views

Compressional Strain Definition

Strain in the x and y directions are defined by the following equations: $ε_x=\frac{du}{dx}+\frac{1}{2}[(\frac{du}{dx})^2 + (\frac{du}{dy})^2]$ $ε_y=\frac{dv}{dx}+\frac{1}{2}[(\frac{dv}{dx})^2 + (\...
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21 views

Solving Hertz Impact ODE with Simulink

I have a question about modelling a nonlinear 2nd order ODE for an impact of a sphere on a thin plate in Simulink. Depending on the solver and solver options, my results in Matlab vary a lot. Some are ...
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1answer
139 views

When calculating the deformed radius of a pressurized thick-walled cylinder, why is the hoop strain used rather than the radial strain?

The context I’ve taken an interest in the design of pressure vessels for use in submarine applications. From a cursory survey of what is used in industry, it seems the de facto standard housing is a ...
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2answers
39 views

Does same stress always produce same strain?

I am reading pure bending from Beer Johnston's mechanics of materials.There,a prismatic member having a plane of symmetry was subjected to equal and opposite couples M and M'acting in that plane.It ...
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2answers
66 views

Rotational and translation DoFs in structural mechanics

I'm a computational person, and I don't quite understand how rotational DoFs are manifested in the linear elasticity equations. I understand the translational DoFs are simply the displacement ...
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54 views

Analytical calculation vs FEA

In terms of calculated stress, strain, displacement etc which method yields more conservative results. Analytical calculation or numeric calculation?
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202 views

Boundary conditions for cantilever beam

I would like to ask about boundary conditions of a cantilever beam with a transverse point (in y dir) load at tip. According to equilibrium equations; We have a normal stress in x direction due to ...
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2answers
79 views

Honeycomb structures vs shear stress

Honeycomb structures are made of top and bottom shells and honeycomb geometry at core. In terms of bending load, maximun normal strains take place on top and bottom hence, sheet parts can support them ...
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1answer
69 views

Stress strain curve [duplicate]

According to uniaxial stress strain curve, specimen fails at a certain stress value since necking begins. My question is that, same stress value appears before necking especially around yield point ...
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13 views

What bending test and torsion test standard are recommend for a surfboard?

I wish to find a bending and torsion test standard for a surfboard (non-prismatic) that is roughly 2000mm long. The closest I've found for bending test is probably those ones that are designed for ...
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1answer
63 views

Why do people build the core of a sandwich structure using composite

Usually I see composite as a laminate wrapped around the core of a sandwich structure. Usually in loading such as bending the bending stress is the highest furthest away from the neutral axis, while ...
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1answer
95 views

How to perform 3 point bending test by using force instead of displacement in ABAQUS?

I know you can apply displacement to a rigid body (cylindrical rod) to perform a 3 point bending test in ABAQUS. Is it possible to apply force to the rod (e.g. rod with super high young's modulus so ...
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1answer
48 views

Calculate surface area and outward normal of each face(non-planar) for a irregular hexahedron.

I am using the vector cross product to calculate each surface area and thus the outward normal. However, this approach fails when the surfaces are non-planar. So what is the best approach to calculate ...
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1answer
62 views

How do we know that deformations occur in a uniform fashion throughout the length of shaft?

When equal and opposite torque act on the two ends of a circular shaft,how do we know that deformations occur in a uniform fashion throughout the length of shaft?Is it because that all cross section ...
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12 views

Is it possible to change a 'relaxing length' of edges for 8 node hexaedral element in 3d FEM

I am using 3D FEM with 8 node brick element to model a certain type of growth/expansion, which is not a plastic deformation. First, I apply a pressure/load and I get displacement and new position of ...
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1answer
27 views

Moment of inertia calculation at different axes [closed]

I have moment of inertia at 2 different axes orientation. How to calculate the angle between the 2 axes?
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1answer
88 views

Can isotropic materials become anisotropic under elastic deformation?

Are there solid materials that begin as isotropic materials (i.e. isotropic elastic parameters) in their natural (i.e. unstressed) state, but that become anisotropic under sufficient stress/strain? ...