The rock mass around an underground opening is subjected to a unique stress path that results in low radial
confinement and both tangential loading and unloading conditions near the wall. As a result, the rock
mass strength near underground excavations is controlled by failure mechanisms dominating at low confinement.
Hence, when constructing underground works in hard rock, two general scenarios are encountered:
(1) structurally controlled gravity-driven failures; and (2) stress-induced failure with spalling and
There is a vast multitude of materials with strongly differing properties. A
copper wire, for instance, can be bent easily into a new shape, whereas a
rubber band will snap back to its initial form after deformation, while the
attempt to bend a glass tube ends with fracture of the tube. The strongly
differing properties are reflected in the application of engineering materials –
you would neither want to build cars of glass nor rubber bridges. The multitude
of materials enables the engineer to select the best-suited one for any
Fracture mechanics is the field of mechanics concerned with the study of the propagation of cracks in materials. It uses methods of analytical solid mechanics to calculate the driving force on a crack and those of experimental solid mechanics to characterize the material's resistance to fracture.In modern materials science, fracture mechanics is an important tool in improving the mechanical performance of materials and components.
Tham khảo sách 'root cause failure analysis plant engineering maintenance series vibration fundamentals r. keith', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả
(BQ) Part 1 book "Mechanical engineering design" has contents: Introduction to mechanical engineering design, materials, load and stress analysis, failures resulting from static loading, shafts and shaft components, screws, fasteners, and the design of nonpermanent joints,... and other contents.
We are a group of dedicated material scientists each with 15–25 years of research
and development experience in the assembly and interconnect technologies of
electronics. Our experience in chemical and mechanical interfacial compatibility
between dissimilar materials dates back to the end of the 1980s. Since the early
1990s with the rise of the electronics industry in Finland, we focused our work
increasingly into the challenges of materials, assembly technologies and reliability
of portable electronics.
The book Renal Failure – The Facts consists of some facts about diagnosis,
etiopathogenis and treatment of acute and chronic renal failure. Acute, as well as
chronic renal failure is great medical problems and their treatment is a burden for the
budget of each government.
Acute kidney injury (AKI), previously termed acute renal failure, is a frequent clinical
condition in critically ill patients especially, in intensive care units (ICU). Its incidence
varies from 1-7 % of all hospitalized patients to 30-50 % of patients in ICU.
(BQ) Part 1 book "Drug and device selection in heart failure" presents the following contents: Renewed understanding of the pathophysiology of heart failure, new diuretics in heart failure, emerging role of aldosterone receptor blockers in heart failure, traditional mechanical support,...
(BQ) Part 2 book "Drug and device selection in heart failure" presents the following contents: Percutaneous mechanical support, cardiac resynchronization therapy, atrial arrhythmias in heart failure, heart transplantation, heart failure, ventricular tachyarrhythmias in patients with congestive heart failure,...
(BQ) Part 2 book "Mechanics of composite materials with MATLAB" has contents: Effective elastic constants of a laminate, failure theories of a lamina, introduction to homogenization of composite materials, introduction to damage mechanics of composite materials.
(BQ) The book "Advanced mechanics of materials and applied elasticity" has contents: Analysis of stress, strain and material properties, problems in elasticity, failure criteria, torsion of prismatic bars, axisymmetrically loaded members, applications of energy methods, stability of columns.
(BQ) Part 2 book "Mechanics of composite materials" has contents: Micromechanical analysis of a lamina; macromechanical analysis of laminates; failure, analysis, and design of laminates; bending of beams.
The following will be discussed in this chapter: Torsional loads on circular shafts, net torque due to internal stresses, axial shear components, shaft deformations, shearing strain, stresses in elastic range, normal stresses, torsional failure modes, angle of twist in elastic range,...