Modulus Of Rupture

I'd also be interested to know that, if there is such a data resource.

The unit of modulus of rupture is MPa in SI unit system.

The most popular method of measuring MODULUS OF RUPTURE (MOR) is three point bending. A specimen (cylindrical or prizmoid) of specified dimension is cut from the sample. Then it is laid on two point supports, a certain distance apart (say 100 mm). A point load is applied to the specimen with a specified rate of loading at the centre. The load of failure (W) is noted and then MOR is calculated like bending moment of the shape.

As per ISO 5014-1997 for refractory products: the specimen is cut in 25mmX25mmX125mm. The distance between the point supports is 100mm. Then MOR is caluculate as below:

MOR = (3WL / 2bd2) MPa

Now-a-days, a lot of MOR testing machines are available that can load the specimen at specified rate and also can record the load of failure automatically thereby calculating MOR.

A measure of the ultimate load-carrying capacity of a beam; equal to the ratio of the bending moment at rupture to the section modulus of the beam.

Modulus of rupture, the measure of the force necessary to
break a given substance across, as a beam, expressed by
eighteen times the load which is required to break a bar
of one inch square, supported flatwise at two points one
foot apart, and loaded in the middle between the points of
support.

If you can be more specific about your application, you will likely get a better answer. However, as shown at http://www.answers.com/topic/modulus-of-rupture, "A measure of the ultimate load-carrying capacity of a beam; equal to the ratio of the bending moment at rupture to the section modulus of the beam." While there are perhaps many more obvious applications, "modulus of rupture" (R or MR) in the sense of maximum bending fiber stress (e.g. basically M/S or Mc/I etc.) in psi at failure of beam members was even tested and reported in multiple different tests in the manufacture and design many years ago e.g. of rigid gray cast iron pipes. "Ring" modulus of rupture could be determined by crunching the number for testing machine (like parallel plate) external-applied load on a unit length of any size pipe ring in a 3-edge bearing test to failure (crushing of, in effect a curved beam) into suitable formulae. A more compact test could also be conducted on a smaller scale in a smaller testing machine by applying third-point loads to a short (~10") span consisting of only a narrow strip of pipe material milled longitudinally about a foot in axial length from a similar pipe ring (thus creating a small straight, essentially rectangular cross-section beam), and in a third means of MR testing longer vertically-cast test bars (with circular cross-section) could also be beam-tested at some longer test machine spans in the case of larger pipes. The axially milled strip (with the width of the small rectangular beam equal to the thickness of the pipe) test is referred to as a "Talbot strip" test. [You can see reference to both these tests/values e.g. in the website from a consultant engineer at http://ww.pennnet.com/display_article/311279/41/ARTCL/none/none/1/Engineering-Analysis-Determines-Rehab-Potential-for-Cast-Iron-Pipe/, and also in ANSI standards A21.1, A21.6, and A21.8 (AWWA C101, C106, and C108 etc.]. I'm sure other fields have many other standardized tests.

The modulus of rupture, MOR is the maximum surface stress in a bent beam at the instant of failure. The MOR strictly only applies to brittle materials. For ductile materials, the MOR entry in the database is the ultimate strength.

Units: SI: MPa & dyne/cm²; Imperial: psi