Lesson 4 Homework Practice Simulations

Simulation Examples

Several simulation examples are provided here. Each of them comes with a clarification file, video didactics, and Ansys simulation file. All simulations are conducted using Ansys Mechanical. Download the student version of Ansys software hither .

(1) Wine Cork Pullout Simulation

Cork material is widely used in wine sealing because of its impermeability and low-cal weight. Another essential feature cork has is its almost zero Poisson'southward ratio, which ways squeezing or pulling in the longitudinal direction does not change its radius. This characteristic is important in providing proficient sealing. In this simulation, a wine cork being pulled out is false. The sealing pressure level and the extraction force are used as parameters for evaluating the quality of sealing. Attempt to replicate the simulation and summate these 2 values. Download the zip file and extract the contents. Go through the Readme file. Follow forth with the provided How To Video file.

(2) Hydraulic Lifting Jack

A hydraulic lifting jack uses hydraulic force to lift a weight that is several orders higher than the input forcefulness. This simulation uses hydrostatic fluid elements to model a hydraulic lifting jack and illustrate the concept of the bulk modulus. In practical applications, oil is unremarkably used as the liquid in a hydraulic lifting jack, considering the high bulk modulus of oil makes the liquid volume well-nigh the aforementioned during the loading process. Yous are encouraged to follow the process in the Readme and video to replicate the model, and fifty-fifty take i footstep further to utilize the bulk modulus of air and bank check how that influences the lifting distance. Download the zip file and extract the contents. Go through the Readme file. Follow along with the provided How To Video file.

(iii) Air Shoe Simulation

This example uses a bladder-like air shoe to illustrate the concept of the bulk modulus. Hydrostatic fluid elements are used to model the air and the ideal gas law describes the air's behavior. Check out the model and find out what the difference is with and without air when the same amount of pressure is applied to the shoe base. Downloadthe nothing file and extract the contents. Go through the Readme file. Follow along with the provided How To Video file.

(4) Auxetic Blueprint of a Shoe Base

An auxetic structure expands in the transverse direction while being stretched in the longitudinal management. Although the material could accept a positive Poisson's ratio, the overall geometry exhibits a negative Poisson's ratio effect. Due to this unique property, the auxetic construction is widely practical to sports. This document illustrates a simulation of the auxetic structure of a shoe base. Download the nil file and extract the contents. Become through the Readme file. Follow along with the provided How To Video file.

Homework

(1) Bars under Tension (An Illustration of Poisson'due south Upshot)

This simulation uses a uniaxial tension exam to illustrate the issue of Poisson'south ratio. V confined with the aforementioned dimension are stretched, and the transverse contraction is plotted. These confined take the same geometry and Immature's modulus, with the merely departure beingness Poisson's ratio. The Poisson's ratio ranges from 0 to 0.5. Manus calculate the normal strain value in the transverse directions for each bar at fourth dimension = 1 second (forty.5% of strain in the longitudinal direction) and compare it to the simulation. Download the zip file and extract the contents. Go through the Readme file. Follow forth with the provided How To Video file.

(2) Active Passive Lateral Globe Pressure Analysis

Geomechanics is an surface area that studies the mechanical behavior of materials like soil, stone and amass materials. Understanding the behavior of geomechanical materials is crucial to civil engineering applications like foundations. This case shows the procedure of analyzing soil under passive and active globe-pressure. An agile earth-pressure state is created by moving the retaining wall away from the soil, and the passive globe-pressure level is produced by moving the wall against the soil. A Mohr-Coulomb fabric is used to study the plastic deformation of soil and its relationship with hydrostatic pressure. Go through the documentation file and answer the questions below.

Download the zero file and extract the contents. Go through the Readme file. Follow along with the provided How To Video file.

The equation of Mohr-Coulomb's criterion of yielding is shown below, in which cohesive and friction angle are soil constants. If the left side of the equation (shear stress) is larger than the right side, yield happens.

(a) Explain why fewer soil yields occur in passive loading than active loading.

(b) What role does volumetric deformation play in the Mohr-Coulomb criterion? Hint: It helps if you plot the Mohr-Coulomb yield criterion in the 10-y plane.