Plastic Moment
Plastic Moment - Related Videos
00:58
Plasticity
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2023
Plasticity is the property where an object loses its elasticity and undergoes irreversible deformation, even after the deformation forces are eliminated. If a material deforms irreversibly without increasing stress or load, then this is called ideal plasticity. For example, when a force is applied to an aluminum rod, it changes its shape, but it does not return to its original shape once the force is removed. Plastic deformation or ductility is thus a permanent deformation or change in the...
01:31
Plasticizers
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2024
Water-reducers, or plasticizers, are chemical admixtures used in concrete to improve strength and workability. These additives reduce the water-cement ratio without compromising workability, lower the cement content while maintaining the same workability, or increase workability to assist concrete placement in inaccessible areas. Plasticizers function by using surface-active agents to create repulsive electrostatic forces between cement particles. This dispersion enhances the concrete's...
10:12
Extraction of Organochlorine Pesticides from Plastic Pellets and Plastic Type Analysis
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Cited by 10 •
2017
Microplastics act as vector of potentially toxic organic contaminants with unpredictable effects. This protocol describes an alternative methodology for assessing the levels of organochlorine pesticides adsorbed on plastic pellets and identifying the polymer chemical structure. The focus is on pressurized fluid extraction and attenuated total reflectance Fourier transform infrared spectroscopy.
01:17
Moment-Area Theorems
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2024
The Moment-Area Theorem is crucial in structural engineering for analyzing beam bending, particularly in applications like building floor supports. This theorem utilizes the geometric properties of the elastic curve, which depicts how a beam deforms under load, to simplify the calculations of deflections and slopes. The theorem is divided into two parts. The first part connects the angle between tangents at any two points on the beam's elastic curve to the area under a curve derived by plotting...
01:14
Moment of Inertia
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2023
The comparability between linear and angular velocities, linear and angular accelerations, and the kinematic equations of translational and rotational motion can be extended to the concept of inertia. If a rigid body is rotating about an axis but is not in translational motion, its translational kinetic energy is zero. However, since each particle undergoes rotational motion, it possesses non-zero velocity and kinetic energy. Thus, the kinetic energy of the rigid body, which is the sum of the...
FAQs
Plastic moment is reached only after yielding has spread across the section, not when yielding first begins. As the applied load increases, stress extends beyond the elastic limit until the entire cross section reaches the material’s yield strength. This distinction matters because the value represents the fully yielded, idealized flexural resistance used in plastic analysis.
The calculation combines the material’s yield strength, fy, with the cross section’s plastic section modulus, Zp, through Mp = fyZp. Yield strength represents the stress level reached throughout the yielded section, while Zp represents the section’s contribution to flexural resistance. Changing either quantity changes the calculated plastic moment.
Once a region forms a plastic hinge, it can undergo rotation while carrying little additional moment. This rotational behavior permits internal forces to redistribute to other parts of the structure as loading continues. In plastic analysis, that redistribution helps describe how beams and frames respond under severe loading before collapse.
Start by identifying the material yield strength and the cross section’s plastic section modulus. Insert those values into Mp = fyZp, then interpret the result as the section’s idealized fully yielded flexural capacity. For structural assessment, the calculated value can support evaluation of whether a beam or frame can sustain the considered loading.
Engineers apply plastic moment concepts in limit-state design, load-capacity assessment, and the evaluation of beams and frames under severe loading. The approach is especially relevant when the analysis considers behavior after yielding has spread through a section. Its result provides an idealized capacity for examining structural resistance and possible force redistribution.
Plastic analysis can indicate where fully yielded regions may develop and how those regions affect the structure’s response as loading increases. A plastic hinge identifies a location capable of rotation with little additional moment, while the broader analysis considers internal force redistribution. This supports interpretation of behavior before the structure reaches collapse.