what's physical meaning of fatigue endurance limit? how to calculate or estimate fatigue crack initiation life?
Why austempered can have higher toughness than quenched and tempered in steel , though both have same hardness? (ASM Metals Handbook,Vol. 4 ). Thank you.
06 July 2017 340 0 View
What’s the fatigue propagation mechanism of ductile and brittle steel ,from the view of physical metallurgy? Thank you very much.
04 May 2017 7,313 2 View
in the plain strain state definition, the Z-direction has stress ,but no strain. is it possible a direction have stress but no strain? likewise, for the plane stress state, there has strain ,but...
10 November 2016 7,411 0 View
low-alloy steel(0.4C-1.4Cr-1.0Al-0.35Mo) ,carbonitriding at 860℃ about 4 hours,quenching and 190℃ tempering .carbon potential and nitrogen potential are 0.75 and 0.2 respectively. Enclosed file...
09 October 2016 6,999 0 View
What’s the Griffith crack length in high-carbon martensite or plate martensite?In quench martensite ,there is no carbide which need tempering to produce carbide precipitation, then what’s the...
09 October 2016 6,886 2 View
what effects temper martensite embrittlement have on fatigue crack nucleation and propagation?
09 October 2016 10,087 26 View
How can calculate fracture load of three-point bending testing through strength and ductility data obtained from tensile testing? and in three-point bending testing ,how to calculate stress...
08 September 2016 6,682 4 View
Will the crack shape and crack tip radius affect KⅠc value and R-Curve? and why ? Thank you for your answers.
08 September 2016 524 53 View
In some steels,is it possible the cleavage fracture happens after large amount of elongation in the uniaxial tension test of intact sample?
07 August 2016 8,407 9 View
What’s the micro-mechanism of cleavage in uniaxial tension test of intact steel sample?→the microcrack forms when the tensile stress exceed cleavage stress, then propagate immediately.Or:→the...
07 August 2016 3,920 0 View
If we map as a continuous motion an ionising electron (beginning its journey at n=1) in an H atom, a specific hyperbolic spiral appears (see animation). When we solve this spiral formula, we find...
07 August 2024 5,343 2 View
Let's say we have a standard, regular hexagonal honeycomb with a 3-arm primitive unit cell (something like the figure attached; the figure is only representative and not drawn to scale). The...
07 August 2024 1,937 1 View
I want to Estimate surface heat fluxes using MyLake, but I don't have all the initial values in model parameters section and other sections,is there a way?
04 August 2024 1,537 1 View
Consider the case of negligible gravity but there is an accelerating reference frame. Its origin traces out a trajectory, or world line, seen in some inertial reference frame. The Lorentz metric...
24 July 2024 1,608 15 View
students already took 1. numerical methods 2. programming language 3. Probability and statistics
09 July 2024 6,271 3 View
Hello dear colleagues and professors Please what is the recommended type of pseudopotentials for QE? ultrasoft or norm conserving?? And from where get all types of pseudos (us, nc, pbe,...
09 July 2024 9,541 5 View
The photo-electric effect does not support quanta in light, since a light particle moving towards a surface cannot cause an electron to move away from the same surface at a right angle. Instead, a...
06 July 2024 2,288 35 View
We assume that the Schrödinger wave equation, iℏ(dψ/dt)= Ĥψ. . . . . (1) is incomplete and cannot be considered a unified field theory. on the other hand, its square, d/dt)partial U= D Nabla^2...
06 July 2024 7,106 8 View
How do the physical demands of performing multiple surgeries in a single shift affect a doctor's overall health and longevity? How does the quality of patient care change when doctors are working...
02 July 2024 9,470 0 View
I'm currently exploring the economic implications of solar PV curtailment versus the installation of battery energy storage systems (BESS). Specifically, I'm interested in recent publications or...
27 June 2024 6,423 2 View