Stress-strain and area readout instrument

Claim 2

Apparatus for determining and reading out results of a tensile test in a tensile testing machine wherein a force is applied to a sample material to elongate the same comprising, means to produce a signal proportional to the amount of force being applied to the sample by the machine; means to produce a signal proportional to the elongation of the sample; means receiving said signal proportional to force and producing a signal proportional to the maximum force to which the sample is subjected; means receiving said signal proportional to elongation and producing a signal proportional to the maximum elongation of the sample; integrating means receiving said signal proportional to force and calculating the amount of work required to elongate the sample and producing a signal proportional thereto; comparator means receiving said signal proportionaL to force; signal means to control said integrating means; means actuated by said comparator means to change said signal means to terminate the calculating of said integrating means; and means receiving and selectively reading out said signals proportional to the maximum force, maximum elongation and work.

Claim 3

Apparatus according to claim 1 wherein said means producing a signal proportional to the maximum force includes peak hold circuitry means which senses and maintains the maximum signal received from said means to produce a signal proportional to the amount of force.

Claim 4

Apparatus according to claim 1 wherein said comparator means includes a relay and said means for producing a signal proportional to maximum elongation includes means to interrupt said signal proportional to elongation and means to hold the elongation signal once interrupted, said relay actuating said means to interrupt said signal proportional to elongation.

Claim 5

Apparatus according to claim 1, wherein said integrating means includes an amplifier whose integration rate is controlled by variable resistors and variable capacitors.

Claim 6

Apparatus according to claim 1 wherein said comparator means includes a relay and said signal means is a logic signal to control said integrating means.

Claim 7

Apparatus for determining and reading out results of a tensile test in a tensile testing machine wherein a force is applied to a sample material to elongate the same comprising, means to produce a signal proportional to the amount of force being applied to the sample by the machine; means to produce a signal proportional to the elongation of the sample; means receiving said signal proportional to force and producing a signal proportional to the maximum force to which the sample is subjected; means receiving said signal proportional to elongation and producing a signal proportional to the maximum elongation of the sample; integrating means receiving said signal proportional to force and calculating the amount of work required to elongate the sample and producing a signal proportional thereto; means to adapt said integrating means to calculate the energy lost by the sample due to its elongation; and means receiving and selectively reading out said signals proportional to the maximum force, maximum elongation, energy lost and work.

Claim 8

Apparatus for determining and reading out results of a tensile test in a tensile testing machine wherein a force is applied to a sample material to elongate the same comprising, means to produce a signal proportional to the amount of force being applied to the sample by the machine; means to produce a signal proportional to the elongation of the sample; means receiving said signal proportional to force and producing a signal proportional to the maximum force to which the sample is subjected; means receiving said signal proportional to elongation and producing a signal proportional to the maximum elongation of the sample; integrating means receiving said signal proportional to force and calculating the amount of work required to elongate the sample and producing a signal proportional thereto; means to adapt said integrating means to calculate the energy lost by the sample due to its elongation; and means receiving and selectively reading out said signals proportional to the maximum force, maximum elongation, energy lost and work.

Claim 9

Apparatus according to claim 6 wherein said means to adapt includes means to impose a negative signal proportional to force on said integrating means so that after one complete cycle of the tensile testing machine, the output of said integrating means is proportional to the energy lost by the sample.

Claim 10

Apparatus according to claim 7 further comprising comparator relay means receiving said signal proportional to force and means to interrupt said signal proportional to force to said integrating means, said comparator relay means actuating said means to interrupt and said means to adapt.

Claim 11

Apparatus for determining and reading out results of a tensile test in a tensile testing machine wherein a force is applied to a sample material to elongate the same comprising, means to produce a signal proportional to the amount of force being applied to the sample by the machine; means to produce a signal proportional to the elongation of the sample; means receiving said signal proportional to force and producing a signal proportional to the maximum force to which the sample is subjected; means receiving said signal proportional to elongation and producing a signal proportional to the maximum elongation of the sample; integrating means receiving said signal proportional to force and calculating the amount of work required to elongate the sample and producing a signal proportional thereto; trigger means to delay the calculation of said integrating means selectively until a predetermined elongation and force is reached after the outset of the tensile test; and means receiving and selectively reading out said signals proportional to the maximum force, maximum elongation and work.

Claim 12

Apparatus for determining and reading out results of a tensile test in a tensile testing machine wherein a force is applied to a sample material to elongate the same comprising, means to produce a signal proportional to the amount of force being applied to the sample by the machine; means to produce a signal proportional to the elongation of the sample; means receiving said signal proportional to force and producing a signal proportional to the maximum force to which the sample is subjected; means receiving said signal proportional to elongation and producing a signal proportional to the maximum elongation of the sample; integrating means receiving said signal proportional to force and calculating the amount of work required to elongate the sample and producing a signal proportional thereto; trigger means to delay the calculation of said integrating means selectively until a predetermined elongation and force is reached after the outset of the tensile test; and means receiving and selectively reading out said signals proportional to the maximum force, maximum elongation and work.

Claim 13

Apparatus fOr determining and reading out results of a tensile test in a tensile testing machine wherein a force is applied to a sample material to elongate the same comprising, means to produce a signal proportional to the amount of force being applied to the sample by the machine; means to produce a signal proportional to the elongation of the sample; means receiving said signal proportional to force and producing a signal proportional to the maximum force to which the sample is subjected; means receiving said signal proportional to elongation and producing a signal proportional to the maximum elongation of the sample; integrating means receiving said signal proportional to force and calculating the amount of work required to elongate the sample and producing a signal proportional thereto; trigger means to delay the calculation of said integrating means until a predetermined point after the outset of the tensile test, said trigger means including comparator relay means which upon actuation permits said signal proportional to force to be received by said integrating means; and means receiving and selectively reading out said signals proportional to the maximum force, maximum elongation and work.

Claim 14

Apparatus fOr determining and reading out results of a tensile test in a tensile testing machine wherein a force is applied to a sample material to elongate the same comprising, means to produce a signal proportional to the amount of force being applied to the sample by the machine; means to produce a signal proportional to the elongation of the sample; means receiving said signal proportional to force and producing a signal proportional to the maximum force to which the sample is subjected; means receiving said signal proportional to elongation and producing a signal proportional to the maximum elongation of the sample; integrating means receiving said signal proportional to force and calculating the amount of work required to elongate the sample and producing a signal proportional thereto; trigger means to delay the calculation of said integrating means until a predetermined point after the outset of the tensile test, said trigger means including comparator relay means which upon actuation permits said signal proportional to force to be received by said integrating means; and means receiving and selectively reading out said signals proportional to the maximum force, maximum elongation and work.

Claim 15

Apparatus according to claim 10 wherein said comparator relay means selectively receives said signal proportional to force and said signal proportional to elongation, said trigger means including means to actuate said comparator relay means selectively upon a preselected force and preselected elongation.

Claim 16

Apparatus according to claim 11 wherein said comparator relay means can also actuate said means receiving said signal proportional to force so that the signal produced thereby is proportional to the force at a preselected elongation, said preselected elongation being determined by said means to actuate said comparator relay means.

Claim 17

Apparatus according to claim 11 wherein said comparator relay means can also actuate said means receiving said signal proportional to elongation so that the signal produced thereby is proportional to the elongation at a preselected force, said preselected force being determined by said means to actuate said comparator relay means.