Microscopy in the Physical Sciences - Fractography. A Workshop for Middle and High School Teachers sponsored by Tennessee Technological University Center for Manufacturing Research Departments of Chemical, Mechanical, Earth Sciences and Curriculum and Instruction
A Workshop for Middle and High School Teachers
Tennessee Technological University
Center for Manufacturing Research
Departments of Chemical, Mechanical, Earth Sciences and Curriculum and Instruction
and The National Science Foundation
Chris Wilson (Mechanical Engineering)
June 19, 2003
“It’s all a hoax, but
it pays the bills.”
In the tree top.
When the wind blows,
The cradle will rock.
When the bough breaks,
The cradle will fall.
And down will come baby,
Cradle and all.
Jack and Jill went up the hill
To fetch a pail of water,
Jack fell down and broke his crown
And Jill came tumbling after.Falling Down is Part of Growing Up
Have you heard of the wonderful one-hoss shay,
That was built in such a logical way
It ran a hundred years to a day,
And then, of a sudden, it—ah, but stay,
I’ll tell you what happened without delay,
Scaring the parson into fits,
Frightening people out of their wits—
Have you ever hear of that, I say?
excerpt from Oliver Wendell Holmes
…an engineering discipline describing the behavior of cracks or crack-like flaws in materials and structures under loading.
Ductile fracture by microvoid coalescence
Brittle fracture (cleavage)
Fatigue crack initiation and growth
Grain boundary separation with microvoid coalescence
Grain boundary separation without microvoid coalescenceMechanisms of Fracture
"I Keep Six Honest..."
I keep six honest serving-men
(They taught me all I knew);
Their names are What and Why and When
And How and Where and Who.
I send them over land and sea,
I send them east and west;
But after they have worked for me,
I give them all a rest.
Excerpt from Kipling’s The Elephant's Child