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hardness
hard
The Oxford Dictionary of Phrase and Fable
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2006
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© The Oxford Dictionary of Phrase and Fable 2006, originally published by Oxford University Press 2006. (Hide copyright information)
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hard hard-boiled denoting a tough, realistic style of detective fiction set in a world permeated by corruption and deceit.
hard cases make bad law difficult cases cause the clarity of the law to be obscured by exceptions and strained interpretations; the saying may now also be used to imply that a law framed in response to a particularly distressing case may not be well-thought-out or well-based. The saying is recorded from the mid 19th century.
hard words break no bones the damage done by verbal attack is limited (compare
sticks and stones may break my bones, but words will never hurt me). The saying is recorded from the late 17th century.
See also
old habits die hard,
between a rock and a hard place,
school of hard knocks.
Cite this article
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Hardness.(Coatings Clinic)
Magazine article from: JCT CoatingsTech; 8/1/2007; ; 700+ words
; Hardness in itself is not a coatings defect, but...tend to suffer defects and failures. Hardness is a difficult characteristic to define...an external force. Why do we measure hardness? The main reason is to see how well the...
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Hardness and hardenability Part one: tips and techniques for hardness testing.(THE HEAT TREAT DOCTOR)
Magazine article from: Industrial Heating; 6/1/2008; ; 700+ words
; For the heat treater, the concept of hardness is well known and the act of hardness testing routine. In fact, it is so repetitive...treating processes have achieved the proper hardness is more important than ever. Let's learn more...
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Hardness testing and surface variation.(Quality Gaging Tips)
Magazine article from: Modern Machine Shop; 7/1/2005; ; 700+ words
; Hardness measurement is a topic that has not been...when dimensional measurements can affect hardness results, it's time to focus on the...a number of ways to define and measure hardness--including some new methods using ultrasonics...
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Hardness testing of ceramics.
Magazine article from: Advanced Materials & Processes; 8/1/1998; ; 700+ words
; ...following sections.) Since hardness is strongly dependent on...always be reported with the hardness outcome. Many contemporary structural ceramics have hardnesses in the 10 to 30 GPa range. For the higher hardness, Vickers indentations made...
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Hardness testing help: this simple nondestructive test continues to provide information quickly and easily.(QUALITY TEST & INSPECTION)(Wilson Instruments Inc.)(Cover story)
Magazine article from: Quality; 6/1/2009; ; 700+ words
; [ILLUSTRATION OMITTED] Hardness testing--a quick, relatively inexpensive...many complex tests are available, hardness testing gets the job done. Instron...Rockwell invented the test that changed hardness testing and allowed the part to be...
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Hardness measurement of bulk wheat by single-kernel visible and near-infrared reflectance spectroscopy
Magazine article from: Cereal Chemistry; 5/1/2003; ; 700+ words
; ...4170 were analyzed for wheat grain hardness using partial least squares (PLS) regression...to the ability of the model to predict hardness were related to protein, starch, and...kernel mass-averaged model, the hardness prediction for 550-1690 nm spectra...
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Hardness-depth profiling on nanometer scale
Magazine article from: Metallurgical and Materials Transactions; 5/1/2001; ; 700+ words
; Three methods for hardness-depth profiling were applied to a...ability to detect local changes in hardness with a depth resolution on the order...in a direction perpendicular to the hardness gradient. In the load-variation...
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Microindentation hardness testing.
Magazine article from: Advanced Materials & Processes; 9/1/1998; ; 700+ words
; ...bulk tests, but the same hardness number is derived. Consequently...the term "microindentation hardness testing," which could be...was limited to steels with hardnesses below [approximately] 450...geometry that would produce hardness numbers nearly identical to...
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Master hardness testing: learn more about hardness testing methods including metals testing, often referred to as indentation hardness testing.
Magazine article from: Quality; 10/1/2008; ; 700+ words
; Hardness, as applied to most materials, and in...be understated. The information from a hardness test can complement and often be used...How important and useful is material and hardness testing? Consider the information provided...
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Making Hardness Tests a Moving Experience.(Brief Article)
Magazine article from: Quality; 8/1/2001; ; 700+ words
; ...are the prime reasons to consider portable hardness testing. Increasingly these days, hardness testing is on the move -- literally. In...conventional Rockwell, Brinell or Vickers hardness testing methods, quality and manufacturing...
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hardness
Book article from: The Columbia Encyclopedia, Sixth Edition
hardness property of matter commonly described...scratched by another substance. The degree of hardness is relative, different substances being...compared with one another. Mohs's scale of hardness (named for Friedrich Mohs), used commonly...
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Mohs' scale of mineral hardness
Book article from: The Oxford Companion to the Earth
Mohs' scale of mineral hardness The hardness of a mineral is mainly controlled by the strength of the bonding...Austrian mineralogist Friedrich Mohs proposed a scale of relative hardness based on fairly common minerals (Mohs' scale). The 10...
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Vickers hardness number
Book article from: A Dictionary of Earth Sciences
Vickers hardness number (VHN) A quantitative measure of the hardness of ore minerals , that is used in their identification. A diamond is...sectional area of the indentation is converted into a number, the Vickers hardness number.
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Mohs' scale of hardness
Book article from: World Encyclopedia
Mohs' scale of hardness The scale is not regular. Diamond, the hardest known natural substance, is 90 times harder than corundum. Mineral Hardness Simple hardness test Talc 1.0 Crushed by fingernail Gypsum 2.0 Scratched...
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Mohs's scale of hardness
Book article from: A Dictionary of Earth Sciences
Mohs's scale of hardness Scale, devised in 1812 by the German...mineralogist Friedrich Mohs , of the scratch hardness of minerals , as: 1 talc ; 2 gypsum...diamond . The scale is linear up to a hardness of 9 (corundum), but then rises...
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