Patrick N.B. Anongba

12 Questions 86 Answers 0 Followers

Questions related from Patrick N.B. Anongba

What works would have earned a Nobel Prize in Physics in solid mechanics?

The mechanics of solids (solids with defects) has had a considerable development since the time of Gebbia, Volterra, Somigliana ... (a century and 1/4, approximately). Can we, in order of...

10 October 2019 10,100 2 View

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...

08 August 2019 4,908 1 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 6,026 5 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 6,885 13 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 974 8 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 2,596 32 View

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

This question emerges from the former Q&A : What are subgrains? If this issue is not understood, we suggest the following: • Characterize the subboundaries formed in deformed specimens in...

01 January 1970 5,188 4 View

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

Biharmonic functions f (∆∆f = 0; ∆: Laplace operator) are used as components of Galerkin vector, in the mathematical treatment of problems with stressed solids, at equilibrium. I have found...

01 January 1970 7,864 17 View

What is the solution G of the following singular integral equation: G(s) + (λ/π) ʃ G(t)dt / (t-s) = F(s), where λ2 = - 1?

I am looking for the solution G of the singular integral equation G(s) + (λ/π) ʃ G(t)dt/(t-s) = F(s), where λ2 = -1; the integration terminals are -1 and 1. In form, it looks like a Carleman type...

01 January 1970 2,961 20 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 9,744 4 View

How are the dislocations, emitted from the tip of an interface crack under load, distributed in the surrounding media?

Are emitted dislocations arranged: i) along the interface?ii) in planes cutting the crack front at one point?iii) in planes containing the crack front?What tell experiments? These questions are...

01 January 1970 8,848 3 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 892 4 View