ISSN:0034-6748    

DOI:10.1063/1.1770278

出版商:AIP    

年代:1945

数据来源: AIP

摘要:

A simple autographic stress‐strain tester is described, which is connected to the test object by a single wire cable. The tester is small, has low inertia, and is most useful on compliant structures encased in refrigerators, ovens, or other inaccessible locations. It is suitable for testing textile cords.

ISSN:0034-6748    

DOI:10.1063/1.1770285

出版商:AIP    

年代:1945

数据来源: AIP

摘要:

The method of solving initial value problems by means of standard punched‐card equipment is illustrated on the equation: ∂2u/∂t2—c2∂2u/∂x2=0 with given initial conditionsu(0,x) andut(0,x) as well as boundary conditionsu(t, x0)=f1(t) andu(t, xn)=f2(t). The plane continuum is replaced by a rectangular net and the differential equation by a finite difference equation. In this manner a value of the functionu(t, x)in a given point of the net is expressed by its values on two lower rows of the net. The punched‐card method consists of two phases: the work scheme which depends only on the equation (and can be used over and over for a given equation), and the instructions for the several operations involved. This method brings about substantial time savings for problems involving a large number of net points and can be extended to non‐linear problems and to several dimensions.

ISSN:0034-6748    

DOI:10.1063/1.1770286

出版商:AIP    

年代:1945

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1770279

出版商:AIP    

年代:1945

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1770280

出版商:AIP    

年代:1945

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1770281

出版商:AIP    

年代:1945

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1770282

出版商:AIP    

年代:1945

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1770283

出版商:AIP    

年代:1945

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1770284

出版商:AIP    

年代:1945

数据来源: AIP