What is the Mohr-Coulomb model?
Mohr–Coulomb theory is a mathematical model (see yield surface) describing the response of brittle materials such as concrete, or rubble piles, to shear stress as well as normal stress. Most of the classical engineering materials follow this rule in at least a portion of their shear failure envelope.
What is PQ diagram?
Fan air volume-static pressure characteristic diagram (P-Q curve) is a curve that shows the relationship between the air volume and the static pressure resulting from loss due to the pressure applied to the inlet and the outlet of the fan.
What is P and Q in soil?
The vertical axis is η, the stress obliquity, defined as q/p’, where in a triaxial test on a cylinder of soil, q is the axial compressive stress, σa, minus the radial compressive stress, σr, and p’ is the mean total compressive stress, p, minus the pore water pressure, u.
What are the assumptions of Mohr-Coulomb theory?
Mohr-Coulomb Theory (MCT) assumes that the normal to the plane of failure lies in the plane containing the maximum and minimum principal stresses. This assumption can be derived from Elasto-Plasticity Theory (EPT).
How do you draw a Mohr-Coulomb circle?
How to draw Mohr’s Circle – GATE examination preparation – YouTube
How do you graph the Mohr failure envelope?
Mohr Failure Envelope – YouTube
What is PQ capability curve?
P-Q-capability diagram means a diagram describing the reactive power capability of a power generating module in the context of varying active power at the connection point; Sample 1Sample 2Sample 3.
What is a PQ diagram of synchronous generator?
Synchronous Generator Capability Curve (P-Q Curve) using MATLAB. The generator operating limits is expressed in the form of the generator P-Q diagram. In other words, generator P-Q diagram provides a safe boundary in which the generator can operate without exceeding thermal limitations.
What is critical state line?
The critical state (or critical void ratio) line is the locus of void ratio-effective stress conditions achieved after shearing a soil to large displacement and after all net void ratio changes and effective stress changes are complete.
What is critical state strength of soil?
Critical state strength
Critical states are unique and do not depend on initial state or stress path. Critical states correspond to shear strains typically 10% to 40%. Critical shear stress (critical state strength) increases with increasing effective normal stress and with decreasing water content.
What is Coulomb’s shear strength equation?
The shear strength is then equal to the sum of the normal stress (σ) and cohesion (c). The Coulomb–Terzaghi equation is:s = c + σ. tan ϕwhere tan ϕ is the coefficient of plane sliding friction, which describes the packing, surface roughness, and hardness of the materials constituting the slope.
What is Mohr’s circle used for?
Mohr’s circle is often used in calculations relating to mechanical engineering for materials’ strength, geotechnical engineering for strength of soils, and structural engineering for strength of built structures.
Why is Mohr’s circle a circle?
And according to Force equilibrium, stresses on opposite planes are equal and opposite in direction. Hence, Shear stress will be equal on two mutually perpendicular planes. Variation of Normal stress and Shear stress value with respect to angle Θrepresents a form of a circle and that circle is known as Mohr’s Circle.
What does a failure envelope represent?
The Mohr failure envelope is the locus of all shear and normal stresses at failure for a given rock material. The Mohr failure envelope delineates stable and unstable states of stress for a given rock material.
How do you find principal stresses using Mohr’s circle?
mohr’s circle example 1 (2/2 – principal and max shear stresses) – YouTube
What is PQ capability?
How do you read a capability curve?
The curve is plotted on the S-plane, where P is the vertical axis and Q is the horizontal axis. For constant power Ia and volt-amperes S = VA, the locus is a circle with a center at O and radius OB (= 3 Vp Ia). Constant P operation lies on a line parallel to Q axis.
What are the PQ considerations with synchronous motor?
P-Q capability diagram of a synchronous turbo generator with operational limits: 1 – maximum available power of the prime mover, 2 – maximal armature current, 3 – practical static stability limit, 3′ – theoretical static stability limit, 4 – minimum field current limit, 5– minimum available power from the prime mover.
How do you draw a capability curve in a synchronous generator?
The machine is assumed to be connected to constant voltage busbars so that the voltage Vp is constant. The length O’O (= Vp) is fixed. The axes Ox and Oy are drawn with their origin O at the tip of Vp. The curve is plotted on the S-plane, where P is the vertical axis and Q is the horizontal axis.
What is critical state theory?
The Critical State concept is an idealization of the observed behavior of saturated remoulded clays in triaxial compression tests, and it is assumed to apply to undisturbed soils.
What is critical strength of soil?
What is peak strength of soil?
The peak strength is the maximum value of the shear stress or the maximum value of the ratio of shear stress to effective mean or normal stress.
What is unit of shear strength?
In SI, the unit is the pascal (Pa) or newtons per square meter. In United States customary units, shear stress is also commonly measured in pounds-force per square inch or kilopounds-force per square inch.
What is C φ soil?
Sandy soil can exhibit some ‘c’ value (very low though) & similarly, Clayey soil can exhibit low (small amount) ‘phi’ value. i.e., they are termed as ‘c-phi’ soil.
What are the 3 principal stresses?
The three principal stresses are conventionally labelled σ1, σ2 and σ3. σ1 is the maximum (most tensile) principal stress, σ3 is the minimum (most compressive) principal stress, and σ2 is the intermediate principal stress.