Translate into English

[LasVegas]

Dear Folks,

I have some German sentence and I would like to translate it into English.
Can someone correct the mistakes? If there are any. But I guess there are some (many )

German:
Eine wichtige Methode, die hauptsächlichen mechanischen Eigenschaften eines Materials zu beurteilen, ist die Durchführung eines Experiments zur Begutachtung seiner Längenänderung, wenn es einer Zugbelastung ausgesetzt wird.

English:
An important way of assessing some of the mechanical properties of a material is the execution of an experiment for consideration the legenth of the specimen at (among) tensile load.

Thanks in advance for your your support.

Best regards
LV

[Delfino]

Dear folks,

I have a few German sentences and I would like to translate them into English.
Can someone correct my mistakes please?
If there are any. But I guess there are many.

German:
Eine wichtige Methode, die hauptsächlichen mechanischen Eigenschaften eines Materials zu beurteilen, ist die Durchführung eines Experiments zur Begutachtung seiner Längenänderung, wenn es einer Zugbelastung ausgesetzt wird.

English:
An important method of assessing the main mechanical properties of a material is to carry out an experiment that messures the variation in length under tensile load.

An important method to assess the main mechanical properties of a material is to carry out an experiment that messures the variation in length under tensile load.

[LasVegas]

thank you very much Delfino for your correction.

I realy appreciate.