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Questions related from Patrick N.B. Anongba
In mechanics, when studying the evolution of a system from initial time t1 to later time t2, the procedure followed is as follows: a) Have a precise knowledge of the system's configuration at time...
last month 477 1 View
Consider a circular disc of homogeneous material (centre O, radius R, thickness e) to which is attached a laboratory Cartesian coordinate system (O; xj), containing a cylindrical hole (diameter...
28 July 2025 9,716 5 View
In fracture, the various expressions of G the crack extension force per unit length of the crack-front (or energy release rate) show invariably a linear dependence of G with the crack half-length...
05 October 2024 3,983 1 View
The aim of the research here is to prevent the propagation of the crack in the fabricated elastic medium with useful applications.
26 July 2024 10,939 3 View
Cross-slip, twinning and fracture are major deformation modes adopted by loaded materials. It appears sound that these apparently different deformation mechanisms can be analysed on the equal manner!
16 June 2024 8,725 3 View
The motivation comes from the following common observation. Blocks of stone with large dimensions (say of the order of three meters or larger) can be easily fractured into two pieces. First,...
29 November 2023 5,338 2 View
Under dominant mode I loading, planar cracks have been observed to move from zero velocity v= 0; for a certain value v= v1, these turn into non-planar crack configurations. An explanation is...
15 October 2023 1,824 1 View
YES! THIS HAS BEEN SHOWN IN “PLANAR CRACKS IN UNIFORM MOTION UNDER MODE I AND II LOADINGS” (ANONGBA 2020). Earlier works have suggested that crack speeds v could not exceed Rayleigh wave velocity,...
04 August 2023 6,405 1 View
This question deserves to be posed and clarified. It is at this price that we will be able to consider an improvement involving analyses including new concepts. The answer to this question is...
12 July 2023 8,990 1 View
This subject is important because evidence of conoidal rough cracks is observed experimentally on various macrographs of broken specimens, under fatigue for instance. Our recent works (see below...
28 April 2023 9,197 2 View
This subject is very important because evidence of circular cracks is observed experimentally on various macrographs of broken specimens, under fatigue for instance. Our recent work (see below in...
24 April 2023 316 1 View
The ʺstress intensity factorsʺ concept is known from Irwin (1948, 1957) who linked these to the energy release rate (crack extension force per unit length of the crack front) in the case of a...
05 January 2023 9,189 2 View
Fatigue fracture surfaces of broken high strength materials exhibit rough conoidal cracks at the vertex of which are located inclusions or heterogeneities Experimental: The observations refer to...
23 December 2022 1,570 2 View
When a planar crack is loaded in tension (mode I) in brittle materials, the velocity V of the crack is observed to increase from zero to a terminal velocity VT, then follows crack branching on...
25 April 2020 8,267 4 View
Does a single-valued description exist for isotropic materials?
13 December 2015 2,808 5 View
Could someone acquaint me with experimental works providing the applied stress at failure of rectangular specimens, horizontally in a wall on one end and vertically loaded at the other end, as a...
13 November 2015 7,771 12 View
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...
13 December 2014 7,200 17 View
This behaviour has been observed in CoSi2 but seems general to brittle materials (see: A study of the brittle fracture characteristics of CoSi2 using laser beam reflections, Acta Metall. et Mater....
16 September 2014 4,604 11 View
We are currently considering an interface crack of length 2a, at the centre of the interface, inside two materials A and B, loaded in tension. Surprisingly, this apparently simple special...
18 April 2014 8,828 13 View
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...
25 March 2014 7,707 4 View
How are interfaces in terms of atomic arrangements (on crossing the interface) in crystalline composite materials?
19 January 2014 3,708 6 View
The attached integral equation has been obtained in the course of investigating a new crack problem that will be made known very soon. It would be of great value if a solution in closed form is...
02 January 2014 5,430 53 View
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...
26 December 2013 5,069 4 View
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 4,125 12 View
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 7,796 7 View
