Patrick N.B. Anongba

17 Questions 92 Answers 0 Followers

Questions related from Patrick N.B. Anongba

Can we eliminate the stress singularity at the tip of the crack by manipulating the elastic constants?

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 9,845 3 View

Can cross-slip, twinning and fracture systems, under applied loadings, receive the same mathematical theory?

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 8,424 3 View

Have gravitational forces been invoked to explain the fracture of large blocks of stone into two parts?

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 5,253 2 View

Can Crack Speeds Exceed Transverse Sound Waves Up To Reach Longitudinal Sound Waves Velocities Within The THEORY OF ELASTICITY?

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 6,341 1 View

Is the treatment of Fracture Mechanics completed within the framework of the theory of Elasticity?

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 8,912 1 View

Is the subject entitled " ROUGH CONOIDAL CRACK GROWING UNIFORMLY UNDER GENERAL LOADING" treated in previous works?

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 9,132 2 View

Is the subject entitled " CIRCULAR CRACK IN UNIFORM EXPANSION UNDER GENERAL LOADING" treated in previous works?

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 245 1 View

What is the concept of the stress intensity factor as defined by Irwin and its utility?

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 9,113 2 View

How to estimate the average rough conoidal crack shape (angle, height, circular basis) observed in high strength materials (steel, nickel alloys)?

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 1,487 2 View

What are the theoretical estimates of the terminal velocity VT of tensile cracks in brittle materials and their validity with respect to experiments?

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 8,207 4 View

What are the relations between failure stresses in brittle specimens tested in tension, compression and bending?

Does a single-valued description exist for isotropic materials?

13 December 2015 2,716 5 View

The bending of a beam by terminal transverse load: what is the relation between applied stress at failure as a function of specimen dimensions?

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 7,668 12 View

Does anyone have a measurement of the stress to fracture an interface crack of length 2a, loaded in tension, as a function of crack half length a?

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 8,768 13 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...

25 March 2014 7,643 4 View

How is an interface in composites constructed?

How are interfaces in terms of atomic arrangements (on crossing the interface) in crystalline composite materials?

19 January 2014 3,660 6 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 4,037 12 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 7,731 7 View