How to estimate the Hertzian conoidal crack angle and length observed during indentation of brittle solids by a spherical indenter?

A simple crack system (Figure 1) can be readily studied to estimate the Hertzian conoidal crack angle and length, and also the stress intensity factor. This is a 3-D brittle elastic half-space...

07 August 2019 4,794 1 View

Can we definitely believe in the existence of an electric potential round a dislocation in a metal that originates from the dilatation of lattice?

A connected question is: what is known (or measured experimentally) about the electromagnetic fields round an elastic-plastic crack that propagates quasi-statically in metallic materials? Based on...

01 January 1970 860 8 View

What is the most general available expression of a three-dimensional biharmonic function?

01 January 1970 7,753 17 View

Why are brittle materials stronger in compression than in tension?

What are the possible reasons for this commonly observed property of real brittle materials.

01 January 1970 2,433 32 View

How can one break brittle materials (with zero or negative Poisson's ratio) when they are loaded in compression?

What are the associated expression of the crack extension force and its physical origin? To understand the origin of this question, please refer to the Q&A : Why are brittle materials stronger...

01 January 1970 793 4 View

I wonder whether the solution of the attached singular integral equation has been used in a previous work involving the interface crack under load?

This singular integral equation, whose solution is also given, is basic in a class of problems involving the interface crack under load. In order to give proper credit to former endeavors, please...

01 January 1970 9,639 4 View

Does anyone have experience with predicting the failure surface in brittle fracture?

POSED PROBLEM: Apply a remote general loading (mixed mode I+II+III) to a large fracture specimen. Find the achieved fracture surface corresponding to the applied loading. We consider large cracks...

01 January 1970 6,779 13 View

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01 January 1970 2,848 20 View

How climb enters the formation of subboundaries in FCC metals (copper for instance), based on experimental findings?

01 January 1970 5,081 4 View

What is known about the propagation of a crack along a non-planar interface in composites?

Interfaces in composites are expected to be non-planar. What attempts have been made to provide expressions for the displacement and stress fields due to dislocations and cracks that lie on a...

01 January 1970 5,921 5 View

Physics: Why do we describe light by referring to its wavelength, but microwaves and radar pulses by referring to their frequency?

In physics, the description of the properties of light generally refers to its wavelength (nm), while in the range of microwaves and radio waves we refer to the frequency of a signal (e.g. kHz or...

03 March 2021 1,682 3 View

Why are the velocities so high in my Boussinesq approximation Fluent simulation?

Hello, I have a mechanism where air rises due to convective flows. In this simulation, nothing is driving the air except this. I understand that the Boussinesq approximation only works for small...

02 March 2021 4,910 3 View

What is the characteristic length to determine the Reynolds number for the scattered turbulent fluid flow?

Dear all, I just saw this example in FB on the difference between laminar flow and turbulent flow. The flow from a pipe hits the sink and scattered. The flow from the pipe is characterized as...

02 March 2021 1,999 5 View

Why almost every element would be metallized in sufficiently high pressure and low temperature?

(This statement is from wikipedia, BTW). What is so special about metallic bond that is limiting high-P low-T state of a matter (as long as individual atoms exist, not white dwarf of neutron star...

02 March 2021 3,309 2 View

Is there a powerful system for the security of the systems distributed on IoT systems?

Is there a powerful system for the security of the systems distributed on IoT systems?

02 March 2021 3,858 10 View

How Relativistic effects is one reason for lanthanide contraction?

The Lanthanide contraction which is the decrease in ionic radii of the elements in the lanthanide series from atomic number 57, lanthanum, to 71, lutetium, is due to poor shielding of the 4f...

01 March 2021 2,272 4 View

What is the state of the drug inside solid lipid nanoparticles (SLNs)?

I am a little confuse with the mechanism of solid lipid nanoparticles (SLNs). The main point of encapsulating drugs into SLNs is because some drugs have low solubility in water. Therefore, SLNs...

01 March 2021 3,703 3 View

What is the density for pva electrospining?

I'm Juan Carlos, a high school student who is working with electropinning, I made an electropinning machine with a 21g needle and a 30kv high voltage source and the distance between my needle is...

28 February 2021 298 3 View

Is there a deep reason for using the squared modulus of the wave function as the probability density of the existence of the particle?

I think we were all surprised at the first time we got to know quantum mechanics that the squared modulus of the wave function is the probability density of the existence of the particle? The role...

28 February 2021 6,282 9 View

For modelling epoxy-based matrices (in composites), which model in ABAQUS is the most suitable, Concrete damaged plasticity or Drucker-Prager model?

I am working on developing a micromechanical FE model for predicting kink-band formation in UD composites. To model matrix plasticity, which model, out of Concrete Damaged Plasticity and...

28 February 2021 5,415 1 View