代写Experiment AM1.6 - Mechanical Testing帮做Python语言

日期：2025-02-07 05:39

Experiment AM1.6 - Mechanical Testing (compressive)

Learning outcomes

By the end of this experiment you should:

•    Understand how standard materials deform under load including at larger strain.

•    Be able to calculate key material properties from raw data.

Description

This laboratory examines the behaviour of a polymer under load. For which you are required to determine some key material properties of each:

o Engineering stress

o Engineering strain

o Young's modulus

o True strain

o Tangent modulus

Procedure

Using the Mechanical Testing Machine (ElectroForce 5500, TA), a polymer material is to be tested under high strain. You will be told how to operate the MTM by the Teaching Assistant (Standard Operating Procedures are available on CANVAS). Ask your Teaching Assistant as to the specific polymer undergoing testing.

WHEN THE ACTUATOR IS ‘ON’, NO USER OR OBSERVER SHOULD TOUCH (OR BE NEAR) THE ACTUATOR AND/OR OTHER MOVING PARTS. THE ACTUATOR MUST BE ‘OFF’ WHEN SPECIMENS ARE BEING PLACED/REMOVED AND/OR the compression is being ATTACHED.

Take note of the strain rate used, as the mechanical properties of the specimen can change drastically at differing strain rates. Observe the computer screen where the load (F) vs. extension (dl) graph is generated automatically, note that these values can be used to calculate stress (ε) and strain (σ),as follows:

Raw data will be provided on CANVAS following the session; however, note down at least 10 sets of force- displacement data (Table 1), to enable you to plot the figures suggested in this report (Figure 2). Observe   the test specimen for its elongation and fracture point during the test.

Use the force-displacement data (Table 1 ), to plot a stress-strain graph (Figure 2). Calculate the values listed in Table 1.

Table 1. Table of force-extension data for the polymer tested. This table should be filled out within your lab session. Ensure you select a range of points to cover the dataset. It is recommended that when writing up    this laboratory, you transfer the full data set provided on canvas to an excel document.

Time [s]	Displacement [mm]	Force [N]	Stress [MPa]	Strain [%]	True Strain [%]

Repeat the experiment at a greater strain rate, and complete Table 2.

Table 2. Table of force-extension data for the polymer tested at astrain rate of           . This table should be filled out within your lab session.

Time [s]	Displacement [mm]	Force [N]	Stress [MPa]	Strain [%]	True Strain [%]

Figure 1. Engineering stress-strain curves for the polymer at astrain rate of              . It is recommended that when writing up this laboratory, transfer the full data set provided on canvas to an excel document to plot your curves. Marks are deducted consistently for poorly presented data.

Figure 2. Engineering stress-strain curves for the polymer at astrain rate of              . It is recommended that when writing up this laboratory, transfer the full data set provided on canvas to an excel document to plot your curves. Marks are deducted consistently for poorly presented data.