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Yakovlev Fedor





Own computer programs for researching in folding formation mechanisms problem

Guide (under construction)



Common description

This folder contains descriptions of own computer programs which were constructed for the solutions (calculations) of some particular problems in frames of researching in folding formation mechanisms. All programs were compiled by Fedor Yakovlev in different times using BASIC code. These programs may be either executive (*.exe) modules or Basic-listing (*.bas). At the last case the TURBO-BASIC program is using as interpreter. There are no limitations on these codes for their using in goals of scientific researching or education. Parts of codes may have defects or parts of functions may work seesaw in some regimes. I shall try to give notice about it in descriptions of codes. There is important limitation that all DOS-codes have correct function of copy-screen of plotted pictures in Windows-98 only in usual cases. You may use all programs in later Windows (up to W-XP) but without copy-screen function.

There are three classes (conventionally) of codes.

1)      First class is kinematic models of forming of different sizes folded structures. The solutions of direct problem are results of these codes. The results may be used as test examples (for other programs) or as the materials for diagnostic diagrams construction.

2)      Second class is codes for algorithmic calculations. There codes are using the test examples or natural structures parameters for the goal to obtain of inverse problem parameters. The especial algorithms are using in each case. Some diagnostic diagrams may be used for the same goals and these diagrams will be described in folder The materials

3)      Third class is some codes for the results visualization functions. It is may be the space of diagnostic parameters for comparison of several models structures or/and natural structures. There are cases when own programs may be more useful then standard software including some statistical functions.

All next programs are describing in order from smaller object to larger ones according to 7 ranks hierarchic system.


FLDSHAP4.EXE The short description. The program code intends for the kinematic modeling of multilayer similar fold formation. The sequence of layers is alternation of competent and incompetent ones. The four places in folds are calculated as main situations of geometry of layers for the fold: the hinge in 1) competent layer and 2) incompetent layer and the flank in 3) competent layer and 4) incompetent layer. The combination of two mechanisms for the competent layer is using in situation 1 and 3. There are buckling (rotation) in the flank which is combining with the flattening (in horizontal direction i.e. to perpendicular to axial surface) and the portions of flattening are the same for both situations. The incompetent layer are deforming by rotation plus shearing along bedding as analogy of buckling. The rotation portion is the same as for competent layer and the shearing portion depends on inclination of flank and thicknesses ratio of competent and incompetent layers. The increasing of hinge thickness of incompetent layer is proportional to shearing value on the flank. The second part of mechanisms combination in situations 2 and 4 is the portion of flattening in the same value as for competent layer (cases 1 and 3). The combination of mechanisms as increments of buckling and flattening is assigning in first preliminary part of code. The ratio of thicknesses of competent and incompetent layers is assigning in the same part of code also as value of final total shortening of fold. All parameters of geometry of layer parts for all four situations are calculating also as ellipse of intra-layer cumulative strain. All parameters are visualizing for each iteration of calculations as pictures and the table. The versions of interrupted for each iteration or uninterrupted kinds of calculations exist. There is the explanation file also including test versions of calculations for education goal.

(under construction) Possible area of application:

(under construction) Recommendations. You may use for examination the next program code FLD-DEMO.EXE. It is the same program as FLDSHAP4.EXE but all parameters have fixed.

Download of code, Download of file-description

FLD-DEMO.EXE (under construction) The short description.


Fld-nom3.bas (under construction) The short description.

Download (Download of Turbo-Basic)

(under construction)

DOM-MOD4.BAS (under construction) The short description.

Download (Download of Turbo-Basic)

(under construction)



CROSS-B2.EXE (under construction) The short description. (Additional files for control and of data for examples will be placed some later)



FLD-STAT.EXE (under construction) The short description. (Additional files for control and of data for examples will be placed some later)


(under construction)

X-Y-CLR.EXE (under construction) The short description. (Additional files for control and of data for examples will be placed some later)




ADVDFRM2.BAS (under construction) The short description.

Download (Download Turbo-Basic)

(under construction)

BUCKL1.BAS (under construction) The short description.

Download (Download Turbo-Basic)

(under construction)



List of papers

Yakovlev F.L. Investigation of the processes and mechanisms of the plicative deformations development in the Earths crust (review of the existing approaches). // Tectonophysics today. Moscow.: UIPE RAS, 2002. pp. 311-332. (in Russ.) PDF

2005-2006, ,