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By Percy Williams Bridgman

During experiments extending over decades at the impression of
high hydrostatic strain on the houses of topic, in which the pres-
sures have been usually intentionally driven to the breaking element of the con-
tainers, I have had get together to detect many fractures below strange
conditions. those fractures have been frequently of an unanticipated nature and
might be definitely opposite to expectancies established on engineering experi-
ence in a reduce variety of stresses. At first my curiosity in those fractures
was a secondary one, and I was once frequently involved with making an attempt to
understand the phenomena purely insofar as was once helpful for the layout
of my strain equipment. With the buildup of fabric, although,
and particularly with the invention of the large influence of hydrostatic
pressure in expanding ductility and in extending the area of strain-
hardening in metal, my curiosity grew in the topic for its personal sake.
Many experiments have been as a result made with the particular function of
understanding larger the character of either the phenomena of fracture below
conditions of excessive rigidity and the phenomena of the huge plastic circulate
which frequently precedes such fractures. A quantity of those investigations
were made in the course of the warfare with functional purposes in brain. The
wartime investigations raised different questions which have been later pursued
further for his or her personal curiosity.
In this booklet I current a coordinated exposition of all this adventure
under quite strange stipulations. I wish that, aside from any intrinsic
interest, it may well help in resulting in a greater realizing of the tough
problems of move and fracture, many of them nonetheless unsolved, in the
narrower variety of stipulations extra frequently encountered in functional

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