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charm


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Related to charm: charm offensive
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Synonyms for charm

attraction

Synonyms

  • attraction
  • appeal
  • fascination
  • allure
  • magnetism
  • desirability
  • allurement

Antonyms

  • unattractiveness
  • repulsiveness

talisman

Synonyms

  • talisman
  • trinket
  • amulet
  • lucky piece
  • good-luck piece
  • fetish

spell

Synonyms

  • spell
  • magic
  • enchantment
  • sorcery

attract

Synonyms

  • attract
  • win
  • please
  • delight
  • fascinate
  • absorb
  • entrance
  • win over
  • enchant
  • captivate
  • beguile
  • allure
  • bewitch
  • ravish
  • mesmerize
  • enrapture
  • enamour

Antonyms

  • alienate
  • repel
  • repulse

persuade

Synonyms

  • persuade
  • seduce
  • coax
  • beguile
  • cajole
  • sweet-talk

Synonyms for charm

the power or quality of attracting

Synonyms

  • allure
  • allurement
  • appeal
  • attraction
  • attractiveness
  • call
  • charisma
  • draw
  • enchantment
  • enticement
  • fascination
  • glamour
  • lure
  • magnetism
  • witchery
  • pull

a small object worn or kept for its supposed magical power

Synonyms

  • amulet
  • fetish
  • juju
  • periapt
  • phylactery
  • talisman

an object or power that one uses to cause often evil events

Synonyms

  • evil eye
  • magic
  • spell
  • whammy

to please greatly or irresistibly

Synonyms

  • beguile
  • bewitch
  • captivate
  • enchant
  • entrance
  • fascinate

to act upon with or as if with magic

Synonyms

  • bewitch
  • enchant
  • enthrall
  • entrance
  • spell
  • spellbind
  • voodoo
  • witch

Synonyms for charm

attractiveness that interests or pleases or stimulates

Synonyms

  • appealingness
  • appeal

Related Words

  • attractiveness
  • siren call
  • siren song
  • winsomeness

a verbal formula believed to have magical force

Synonyms

  • magic spell
  • magical spell
  • spell

Related Words

  • speech communication
  • spoken communication
  • spoken language
  • voice communication
  • oral communication
  • speech
  • language
  • conjuration
  • incantation
  • hex
  • jinx
  • whammy
  • curse

something believed to bring good luck

Synonyms

  • good luck charm

Related Words

  • object
  • physical object
  • amulet
  • talisman
  • fetich
  • voodoo
  • juju
  • fetish
  • hoodoo

(physics) one of the six flavors of quark

Related Words

  • flavour
  • flavor
  • high energy physics
  • high-energy physics
  • particle physics

attract

Synonyms

  • bewitch
  • captivate
  • enamor
  • enamour
  • entrance
  • trance
  • enchant
  • becharm
  • beguile
  • capture
  • fascinate
  • catch

Related Words

  • hold
  • attract
  • appeal
  • work

control by magic spells, as by practicing witchcraft

Synonyms

  • becharm

Related Words

  • glamour
  • hex
  • jinx
  • witch
  • bewitch
  • enchant
  • control
  • command

protect through supernatural powers or charms

Related Words

  • protect

induce into action by using one's charm

Synonyms

  • influence
  • tempt

Related Words

  • persuade
  • magnetise
  • mesmerise
  • mesmerize
  • spellbind
  • magnetize
  • bewitch
References in classic literature ?
Cure them if they are sick,"' Kim quoted relishingly, "'but by no means work charms.
None but the ignorant deny' - a thick, heavy voice boomed through the darkness, as a figure came to rest squatting - 'None but the ignorant deny the value of charms.
Let the hakim and the young priest settle between them whether charms or medicine most avail.
Him I abolished by arguments and prayers, proving that our charms are worthier than his coloured waters.
She liked charms with plenty of ink that one could wash off in water, swallow, and be done with.
Why do you have to obey the charm of the Golden Cap?
Soon he discovered that one of the charms was labelled: "For flesh wounds," and this the boy separated from the others.
I wonder whether the charm worked--you remember Hollis's charm, of course.
Not being able to imagine what could be the cause of so much obstinacy the King began to fear, lest, in spite of all his precautions, she might have heard of the charms of the Prince his son, whose goodness, youth and beauty, made him adored at Court.
I might mention all the divine charms of a bright spring day, but if you had never in your life utterly forgotten yourself in straining your eyes after the mounting lark, or in wandering through the still lanes when the fresh-opened blossoms fill them with a sacred silent beauty like that of fretted aisles, where would be the use of my descriptive catalogue?
adorned with all the charms in which nature can array her; bedecked with beauty, youth, sprightliness, innocence, modesty, and tenderness, breathing sweetness from her rosy lips, and darting brightness from her sparkling eyes, the lovely Sophia comes!
Her mind was every way equal to her person; nay, the latter borrowed some charms from the former; for when she smiled, the sweetness of her temper diffused that glory over her countenance which no regularity of features can give.
But this, to say the truth, is often too dearly purchased; and though it hath charms so inexpressible, that the French, perhaps, among other qualities, mean to express this, when they declare they know not what it is; yet its absence is well compensated by innocence; nor can good sense and a natural gentility ever stand in need of it.
Over the past several years Pandora has become the new trend in charm bracelets along with the stackable Alex and Ani bracelets that feature one charm per bangle and other brand names that produce similar styles.
Balza hand-makes each photo charm that she carefully places in high-quality stainless steel lockets.
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Element Aspect Ratio

December 14, 2010

In my last entry, I wrote about how to obtain accurate stress results by ensuring that there were at least two elements across the thickness in areas of interest.  However to obtain accurate results, the quality of the mesh itself must be taken into account.

In order to talk about mesh quality, there are a couple important metrics that need to be taken into consideration.

The aspect ratio of an ideal tetrahedral element is 1.0.  This is a ratio of the longest edge to the shortest normal dropped from a vertex to the opposite face, normalized with respect to the shortest normal dropped from a vertex to the opposite face of a perfect tetrahedral element.  A general rule of thumb is to not have more than 10% of the elements with an aspect ratio higher than 10.  Extremely large values >> 40 should be closely examined to determine where they exist and whether the stress results in those areas are of interest or not.

Figure 1: This is an example of a first order tetrahedral solid element with an aspect ratio of 1.0.  The aspect ratio is the ratio of the longest edge to the shortest normal dropped from a vertex to the opposite surface normalized with respect to a perfect tetrahedral element.  In this case, the shortest normal has a value of 1.0 because it is normalized with respect to itself.

Figure 2:  On the left is a picture of a tetrahedral element with an aspect ratio of 1.0.  The element on the left has a much larger aspect ratio.

In SolidWorks Simulation, you can create a mesh plot showing the values of the aspect ratio within the mesh after it has been generated.

Figure 3: Right click on the Mesh icon in the Simulation tree> “ Create Mesh Plot”

Figure 4:  You have the choice to create a mesh plot, an aspect ratio plot, or a jacobian plot.

Figure 5:  We see that the maximum aspect ratio in this mesh is 3.79, well within acceptable limits

The second metric used to determine mesh quality is the Jacobian Ratio.  This method is only available for second order (High quality) mesh elements.  Parabolic (second order) elements are able to map curvilinear geometry more accurately than the first order linear elements.  The midside nodes are placed on the actual geometry of the model, and in extremely sharp or curved boundaries, the edges can cross over each other.  This can result in a negative jacobian ratio which will cause the solver to fail.

Figure 6:  The Jacobian is a measure of the curvature of the edge and distortion at the mid-side node.

Figure 7:  This is an example of a 2-D representation of an element with a Negative Jacobian ratio.  The curvature of the geometry that the element was trying to map was too great for the size of the element, causing the edge to collapse in on itself creating a negative jacobain ratio.  This will cause the solver to fail.

As with the first order elements and the aspect ratio, the jacobian ratio of a perfect tetrahedral element with linear edges is 1.0.  The jacobian ratio of an element increases as the curvature of the edges increase and are calculated at the selected number of Gaussian Points for each tetrahedral element.  In general, elements with a jacobian ratio less than 40 are acceptable.

You can also create a Mesh Check Plot similar to the Aspect ratio check in SolidWorks.

Figure 8:  The Jacobian check plot shows that the only areas where there are elements with a non-unity Jacobian value are areas where there is actual curvature of the geometry.  Here the maximum value of the Jacobian is 1.095, and there is no need to further refine the mesh.

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9 Comments
  1. George permalink

    I have a simulation where elements in my area of interest have an aspect ratio of about 10-15. The jacobian ratio in that area is good, about 1. Which of the two is more important for an evaluation of the quality of the mesh? Will I get results with precision ? Generally, what is the acceptable aspect ratio for a simulation in SW?

    Reply
    • andreweib permalink

      Hey George,
      I believe that an element aspect ratio of less than 10 is generally acceptable. in regard to which one is more important, I am not sure which of the two is more important, but less than 40 for jacobian, but not negative, and less than 10 should be good bounds for good results. also I think that in areas where the element aspect ratio or jacobian are high or above the bounds will have poorer results.

      – Andrew

      Reply
  2. George permalink

    Thanks a lot for the answer
    George

    Reply
  3. George permalink

    Hi again Andrew. My question might seem silly to you. Suppose I have a part and I want to add a fixture. I want to restrain its movement along ONE AXIS only. The green arrow that appears in SW shows the direction towards the body CAN or CAN’T move? I’ m asking because every time I m trying to add a restrain along one direction only (along x, or along y, or along z, or along the radial direction for cylinders), SW gives me the option “reverse direction” and when I click on it the direction of the green arrow changes. Pretty confusing. I’d highly appreciate your help.

    Reply
    • andreweib permalink

      Hey George,

      The green arrow indicates the direction that is being fixed (can’t move). If the green arrow is reversing direction when you click on “reverse direction” then it might be that you have specified a displacement. I am guessing that you used the advanced fixtures option and are using the “use reference geometry” option? If you specify a 0 displacement then it is fixed in the direction of the green arrows, or is displaced equivalently.

      Hope this helps,

      -Andrew

      Reply
  4. George permalink

    Yes, i used advanced fixtures and reference geometry. Suppose i want to define a very small displacement, let’s say 0,001 mm towards the +x axis (to the right). The green arrow should also point towards +x or towards the opposite direction? Thanks in advance. It’s a pity you stopped working on this blog. It’s really helpful.

    Reply
    • andreweib permalink

      Hey George, the direction of the arrow will indicate the direction of displacement, so in this case you would want the arrow to point towards the +x direction when you want to define a .001mm displacement in the +x direction or if you want the reverse, in the -x direction. Yeah I stopped working on this blog after I changed jobs and went back to school for a Master’s degree, but if you have more questions feel free to ask, I’ll try to get to answer them if I can.

      If you have a local Solidworks Reseller/VAR they may offer classes in Solidworks Simulation. I find one of the best parts about that is it comes with a manual which has helpful examples. Unfortunately Solidworks does not sell these manuals unless you take a class, but there are also other books you can purchase from third party authors as well.

      -Andrew

      Reply
      • George permalink

        Thanks a lot for the help and the info. I have to use SW FEM calculations for my job but unfortunately I didn’t have any FEM lessons during my university years, so I ‘ve bought a book covering basic FEM theory and SW FEM and I m trying to figure everything out by myself. it is surprising that I didn’t find this basic answer anywhere. Good luck with your Master’s degree. Cheers

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