KTH Solid Mechanics
Testing Techniques in Solid Mechanics (SE2123) Spring 2012 – 6 hp
After the course, participants shall be able to perform some solid mechanical experiments
and interpret the results. They will have learnt the theoretical background and will be able to
determine parameters defined in standards as well as parameters in material models. They
will have acquired practical experience of use of experimental equipment including servohydraulic test machines.
Responsible teachers
Nils-Gunnar Ohlson (examiner, lectures) 7908641, 070-7284214, ngohlson@kth.se
Veronica Wåtz (laboratory tasks) 7909378, vwatz@kth.se
Svetlana Borodulina (assistant) 7907550, svebor@kth.se
Guest lecturers
Niklas Hammarström and Martin Linderoth, Scania
Literature
Course compendium: Testing techniques in solid mechanics – 2012, 100 SEK, sold at the
students desk at the department, opening hours Mon-Fri 9-11
Course sign-up
Due to the extensive use of laboratory equipment including continuous supervision, the
number of participants must be limited to 24. The KTH course selection procedure is the
basis for course participation. The course selection is valid until the first lecture, unless
otherwise has been arranged with the examiner. Participation will be checked (“upprop”) at
the first lecture. Late course selection is possible down to this time, on condition space is
available.
Course start
Monday 16th January 2012 at 10.15-12.00 in D33
Laboratory work
Five compulsory labs, to be performed in groups of two. Participants are requested to study
the theory prior to each lab and shall be able to pass a short test under Svetlana’s
supervision. The procedure is as follows. Each Monday, the test for “the lab of the week” will
be available on the website. Make the test (answer the questions) together in your group
and submit the result to Svetlana by the following Tuesday at noon (12 o’clock). She will
correct them promptly and book a lab time for your group, and you will be notified by 17
hours on that same day. (It is assumed that you have passed the test, of course.) Reports
shall be written and submitted, see below under course program.
Lab no. 1
Strain gages and strain measurement. The Wheatstone bridge. Determination of Young’s
modulus and eigenfrequency. Temperature compensation.
Lab no. 2
Uniaxial tension test of an elastic-plastic material. Data acquisition and requirements for the
measuring system. Correction for inhomogeneous deformation (formation of a waist). True
stress and true strain. Hardness testing.
Lab no. 3
Determination of the critical stress-intensity factor (“fracture toughness”). Parameters of
Paris’ law.
Lab no. 4
In-plane visual measurement of deformation using speckle. Experimental determination of
elastic properties of the material. Stress concentration at a hole. ARAMIS measuring and
data analysis system. Analysis of results and comparison with handbook solutions.
Lab no. 5
Experimental measurements of vibration spectrum, strains, and acceleration. Analysis of
vibration spectrum and its use for fatigue life assessment. This lab will be carried out at
Scania.
Reports.
Reports shall contain test results, evaluation of parameters desired and they shall be written
according to enclosed instructions. Only paper version, signed by both lab participants, is
accepted. Please hand these in within one week after you have done the lab. To be delivered
in Svetlana’s mail box, 2nd floor at the Department.
Course requirements
Lab work (LAB1; 3 hp)
Participation in the five labs. Passed grade on all reports (both contents and format will be
reviewed).
Test (KON1; 0 hp)
Participants do the test (together in their group) before booking lab time. Test dates will be
stated on each test sheet.
Written examination (TEN1; 3 hp)
This examination is voluntary! Examination date is Wednesday 14th March (8-13).
Registration on MINA SIDOR is required. Grades: 12-15 give E, 16-19 D, 20-22 C, 23-26 B 2736 A. Examination consists of six problems.
Course grade
Each lab will be graded with “fail”, “pass”, or “exceed”. Pass or exceed on all labs will yield
course grade at least E. If 3 or more reports are exceed, grade will become at least D. If five
reports are exceed, grade will be at least C. If the grade of the examination (if taken) exceeds
the total lab report grade, the course grade will be that of the examination.
Web-site
The course web-site is available through links from www.hallf.kth.se . Please watch out for
information currently.
KTH, January 2nd, 2012
N G Ohlson