Instructional Design Document Impact Test STAM Interactive Solutions.

Instructional Design Document

STAM Interactive Solutions

Impact Test

Demo Outline (For reference)

Animated pageCharpy Experiment Simulation4

Animated pageEquations3

Animated pageTest Specimen – Support Conditions2

Animated pageImpact Test1

Page TypeTopic NameTopic Number

Impact Test

Solid Mechanics

An impact test is a dynamic test conducted on a selected specimen which is usually notched. The specimen is struck and broken by a single blow in a specially designed machine.

This demo illustrates the experiment setup, procedure and the energy absorbed in an impact test.

Impact Test

Solid Mechanics

Impact Test

Test-specimen Pendulum Machine

Aim: To measure the toughness, or energy absorption capacity of the materials.

Notch

Impact Test

Solid Mechanics

Test Specimen – Support Conditions

Charpy Test Setup

Notch

Specimen

Point of Impact

SpecimenSimple beam support

44m

Impact Test

Solid Mechanics

Notch

Izod Test Setup

Cantilever beam support

Test Specimen – Support Conditions

Impact Test

Solid Mechanics

Equations

Initial Energy (Ei) = mga = Wa

Impact Velocity = v = (2ga)

Energy after rupture (Er) = mbg = Wb

Energy absorbed by the specimen (Eab) = Ei – Er

= mga - mgb

1/2

Impact Test

Solid Mechanics

Charpy Experiment Simulation

Drag the specimen to the support and click hammer.

Specimen

Simple beam support

Hammer

1. Load the Specimen.

2. Release the Pendulum.

Impact Test

Solid Mechanics

1. Load the Specimen.

2. Release the Pendulum.

Click the Quiz button.

150

Charpy Experiment Simulation

0

Indicate P.E = 300JEnergy Absorbed = 120J

Impact Test

Solid Mechanics

Resources

Reference Links:

• http://en.wikipedia.org/wiki/Charpy_impact_test

• http://en.wikipedia.org/wiki/Izod_impact_strength_test

• http://www.matweb.com/reference/izod-impact.aspx

• http://www.steeluniversity.org/content/html/eng/default.asp?catid=151&pageid=2081271949

Impact Test

Solid Mechanics

Results of the Charpy Impact test and the Izod impact test

cannot be compared

can be compared if the specimens have the same dimensions

should be used in tandem to estimate the toughness of the material

can be compared if the pendulum / hammer has the same weight

Impact Test

Solid Mechanics

Results of an impact test

can be used directly in design equations for components

can be used in design equations for components only after empirical correlation has been obtained

can be used in design equations after adjusting for temperature difference only

cannot be used for design calculations

Impact Test

Solid Mechanics

Impact tests

are independent of specimen size

are independent of notch size

are dependent on specimen size

are dependent on notch size

Impact Test

Solid Mechanics

The temperature of the specimen

does not affect the results of the test

is directly proportional to the measured toughness

is inversely proportional to the measured toughness

affects the measured toughness differently for different materials

Impact Test

Solid Mechanics

Results of the impact test

can be used directly to estimate yield strength

cannot be used directly to estimate yield strength

can be used to estimate yield strength based on empirical correlations

can be used to estimate yield strength based on fundamental relationships